Bioelectric potential measurement device

Abstract

This bioelectric potential measurement device is provided with: an electrode sheet that acquires a biological signal; a device having a contact part that connects to the electrode sheet; and a connection member that sandwiches the electrode sheet between the connection member and the device and thereby connects the electrode sheet to the contact part. The connection member has a fitting part that fits to the device, and the electrode sheet has a shape corresponding to the fitting part.

Description

Bioelectric potential measuring device

[0001] The present invention relates to a bioelectric potential measuring device. This application claims priority to Japanese Patent Application No. 2023-048423, filed on March 24, 2023, the contents of which are incorporated herein by reference.

[0002] The following Patent Document 1 discloses a bioinformation output device that is attached to the skin of a subject, detects electrical biosignals generated within the subject's body from the skin, and outputs the bioinformation obtained by processing the biosignals.

[0003] Japanese Patent Application Laid-Open No. 2022-120573

[0004] In the bioinformation output device (biopotential measuring device), the housing (device) and the attachment sheet (electrode sheet) are connected by a roughly C-shaped housing holder (connecting member). Therefore, in the past, it was necessary to increase the size of the housing and housing holder to correspond to the size of the attachment sheet.

[0005] The present invention has been made in consideration of the above problems, and aims to provide a biopotential measuring device that can reliably connect an electrode sheet to a device regardless of the size of the electrode sheet.

[0006] (1): A biopotential measuring device according to one aspect of the present invention comprises an electrode sheet for acquiring biosignals, a device having a contact portion connected to the electrode sheet, and a connecting member for connecting the electrode sheet to the contact portion by sandwiching the electrode sheet between the device and the connecting member, wherein the connecting member has a fitting portion that fits into the device, and the electrode sheet has a shape that corresponds to the fitting portion.

[0007] According to the biopotential measuring device of this aspect, by sandwiching the electrode sheet between the device and the connecting member, the electrode sheet can be reliably connected to the contact portion of the device. Furthermore, because the electrode sheet has a shape that corresponds to the fitting portion of the connecting member, there is no need to enlarge the device and connecting member to match the size of the electrode sheet. Therefore, according to the biopotential measuring device of this aspect, a biopotential measuring device can be obtained that can reliably connect the electrode sheet to the device regardless of the size of the electrode sheet.

[0008] (2) In the bioelectric potential measuring device according to aspect (1), the device may have a fitted portion into which the fitting portion fits.

[0009] In this case, the connecting member is less likely to come off the device.

[0010] (3) In the bioelectric potential measuring device according to aspect (1) or (2), the fitting portion may be provided in pairs in at least the short side direction of the electrode sheet.

[0011] In this case, the device can be made smaller in size in the longitudinal direction of the electrode sheet.

[0012] (4): In the bioelectric potential measuring device of aspect (3), the fitting portion may have a first fitting portion provided in a pair in the short side direction, and a second fitting portion that fits into the device at a position different from the first fitting portion.

[0013] In this case, the connecting member is less likely to come off the device.

[0014] (5) In the bioelectric potential measuring device according to aspect (4), the second fitting portion may be provided in parallel to the first fitting portion.

[0015] In this case, the stability of the fitting of the connecting members can be increased.

[0016] (6) In the bioelectric potential measuring device according to aspect (4) or (5), the second fitting portion may be fitted to the device in a different orientation from that of the first fitting portion.

[0017] In this case, rotation of the device around an axis extending in the short-side direction of the electrode sheet can be restricted by the engagement of the second engagement portion.

[0018] (7) In the bioelectric potential measuring device according to any one of (4) to (6), the second fitting portion may slide in the longitudinal direction of the electrode sheet and fit into the device.

[0019] In this case, it becomes easier to fit the second fitting portion to the device.

[0020] (8): In the bioelectric potential measuring device according to any one of (1) to (7), the contact portion may be provided in plurality, and the connecting member may connect the electrode sheet to the plurality of contact portions.

[0021] In this case, the electrode sheet can be connected to a plurality of contact points at the same time.

[0022] (9): In the bioelectric potential measuring device according to any one of (1) to (8), a positioning mechanism for positioning the electrode sheet and the contact portion may be provided, and the positioning mechanism may include the fitting portion.

[0023] In this case, the fitting portion also serves as a positioning mechanism, so the number of parts in the bioelectric potential measuring device can be reduced.

[0024] (10): In the bioelectric potential measuring device of aspect (9), the positioning mechanism may include a through hole formed in the electrode sheet corresponding to the fitting portion, through which the fitting portion is positioned.

[0025] In this case, the fitting portion of the connection member is inserted into the through-hole formed in the electrode sheet and fitted into the device, so the outer shape of the electrode sheet can be freely expanded.

[0026] (11) In the bioelectric potential measuring device according to aspect (10), the through holes may be provided in pairs, and the contact portion may be disposed between the pair of through holes in a plan view.

[0027] In this case, the pair of fitting portions of the connection member are inserted into the pair of through holes formed in the electrode sheet, so that the electrode sheet can be positioned with high precision relative to the contact portion.

[0028] (12): In the bioelectric potential measuring device of aspect (9), the positioning mechanism may include a constricted portion formed on the outer edge of the electrode sheet in correspondence with the fitting portion, in which the fitting portion is disposed.

[0029] In this case, even if it is not possible to form a through hole in the electrode sheet, the electrode sheet can be positioned relative to the contact portion by the constricted portion.

[0030] (13) In the bioelectric potential measuring device according to any one of (1) to (12), the connecting member may include an elastic portion at an opposing portion that faces the contact portion across the electrode sheet.

[0031] In this case, the electrode sheet can be reliably connected to the contact portion by the pressure of the elastic portion.

[0032] (14): In the bioelectric potential measuring device according to any one of the aspects (1) to (13), the connecting member may have a convex portion that protrudes toward the electrode sheet at an opposing portion that faces the contact portion across the electrode sheet.

[0033] In this case, the electrode sheet can be reliably connected to the contact portion by the pressure from the convex portion.

[0034] (15): In the bioelectric potential measuring device according to any one of (1) to (13), the connecting member may have a recess in the opposing portion that faces the contact portion across the electrode sheet, the recess being recessed toward the side opposite the electrode sheet.

[0035] In this case, the recess can prevent the electrode sheet from being pressed against the contact portion with excessive force.

[0036] (16): In the bioelectric potential measuring device according to any one of (1) to (15), the connecting member may have an opposing portion that faces the contact portion across the electrode sheet, and the opposing portion may be transparent.

[0037] In this case, the connection state between the electrode sheet and the contact portion can be visualized.

[0038] (17): In the bioelectric potential measuring device according to any one of the aspects (1) to (16), the connecting member may have an extension portion extending laterally beyond the side end surface of the electrode sheet in the short direction of the electrode sheet.

[0039] In this case, the bioelectric potential measuring device can be easily removed from the living body by placing a finger on the extension.

[0040] (18) In the bioelectric potential measuring device according to any one of (1) to (16), the connection member may be disposed inside the outer edge of the electrode sheet in a plan view.

[0041] In this case, since the connection member is covered with the electrode sheet, fingers etc. are less likely to get caught on the connection member, and the bioelectric potential measuring device is less likely to unintentionally come off from the living body.

[0042] (19): In the bioelectric potential measuring device according to any one of (1) to (18), the movable connecting member may be integrated with the device.

[0043] In this case, the device and the connection member are integrated, which can prevent the connection member from being lost and can also improve the stability of the connection between the device and the connection member.

[0044] (20): In the bioelectric potential measuring device according to any one of (1) to (19), the electrode sheet may have a transparent electrode.

[0045] In this case, the electrode sheet has transparent electrodes, which improves visibility and makes it easier to check for misalignment.

[0046] (21): In the bioelectric potential measuring device according to any one of (1) to (20), at least one of the device and the connecting member may be provided with an abutment portion that abuts against the other via a portion of the electrode sheet that does not overlap with the contact portion.

[0047] In this case, the contact portion acts as a spacer to prevent excessive force from being applied to the contact portion.

[0048] (22) In the bioelectric potential measuring device according to aspect (21), the contact portion may have a curved corner.

[0049] In this case, the load (stress concentration) applied to the electrode sheet from the corners of the contact portion can be reduced.

[0050] (23) In the bioelectric potential measuring device according to any one of (1) to (22), the contact portion may have a curved corner.

[0051] In this case, the load (stress concentration) applied to the electrode sheet from the corners of the contact portions can be reduced.

[0052] (24): In the bioelectric potential measuring device of any one of (1) to (23), the electrode sheet may have a conductive portion connected to the contact portion, and the conductive portion may include a terminal portion in contact with the contact portion, an electrode portion in contact with the living body side, and a wiring portion connecting the terminal portion and the electrode portion.

[0053] In this case, the electrode portion that comes into contact with the living body side can be placed at a location away from the contact portion on the device side.

[0054] (25): In the biopotential measuring device of aspect (24), the electrode sheet has a plurality of the conductive portions, and a terminal group including a plurality of the terminal portions and an electrode group including a plurality of the electrode portions may be arranged spaced apart from each other in a planar view.

[0055] In this case, the electrode group connected to the living body side is positioned away from the terminal group connected to the device side by the connecting member, thereby preventing the electrode group from coming off from the living body side.

[0056] (26): In any one of the aspects of the bioelectric potential measuring device of (25), the electrode group may have a plurality of electrode portions arranged in a straight line, and the terminal group may be arranged on an extension line of the plurality of electrode portions.

[0057] In this case, the electrode sheet can be made smaller.

[0058] (27) In the bioelectric potential measuring device according to any one of (24) to (26), the surface of the terminal portion may be harder than the wiring portion.

[0059] In this case, the surface of the terminal portion becomes hard, so that it can be reliably connected to the contact portion, and the connection between the terminal portion and the contact portion can be stabilized.

[0060] (28) In the bioelectric potential measuring device according to any one of (24) to (26), the surface of the terminal portion may have a hardness equal to or less than that of the wiring portion.

[0061] In this case, the surface of the terminal portion becomes soft, so that it can deform in accordance with the contact portion, thereby stabilizing the connection between the terminal portion and the contact portion.

[0062] (29): In the bioelectric potential measuring device of any one of the aspects (24) to (28), the device may have a housing portion in which the connecting member is housed, and the housing portion may have the contact portion to which the terminal portion is connected.

[0063] In this case, the connecting member does not need to protrude into the living body, thereby reducing the discomfort felt by the living body.

[0064] (30): In the bioelectric potential measuring device of aspect (29), the storage section has a side wall section on which the contact section is arranged, and the electrode sheet has a bent section that is sandwiched between the side wall section and the fitting section within the storage section, and the bent section may be provided with the terminal section that is connected to the contact section.

[0065] In this case, there is no need to place a connecting member on the living body side of the electrode sheet, which prevents the electrode sheet from peeling off from the living body side.

[0066] (31): In the bioelectric potential measuring device according to any one of (24) to (30), the fitting portion may have a restricting portion that restricts deformation of the electrode sheet in a first direction.

[0067] In this case, the expansion and contraction of the electrode sheet in the first direction is restricted, so that the connection between the terminal portion and the contact portion can be stabilized.

[0068] (32) In the bioelectric potential measuring device according to the aspect (31), the terminal portion may be formed to be long in a second direction intersecting the first direction.

[0069] In this case, by extending the terminal portion in the second direction in which the expansion and contraction of the electrode sheet is not restricted, the connection between the terminal portion and the contact portion can be stabilized.

[0070] (33) In the bioelectric potential measuring device according to aspect (31) or (32), the electrode portions may be provided separately in a second direction intersecting the first direction.

[0071] In this case, when the electrode sheet expands or contracts in the second direction, stress is less likely to be applied to the electrode portion.

[0072] (34): In the bioelectric potential measuring device according to any one of the aspects (31) to (33), the connecting member may have an opposing portion that faces the contact portion across the electrode sheet, and the electrode portion may be positioned at a distance from the connecting member in a second direction that intersects with the first direction that is greater than the thickness of the opposing portion.

[0073] In this case, peeling of the electrode portion due to the effect of the electrode sheet floating from the living body side caused by the thickness of the facing portion can be suppressed.

[0074] (35): In the bioelectric potential measuring device according to any one of (1) to (34), the electrode sheet may be provided with a shape-retaining portion near the contact portion that is harder than the base material of the electrode sheet.

[0075] In this case, the positioning of the electrode sheet and the contact portion can be stabilized.

[0076] (36): In the bioelectric potential measuring device according to any one of (1) to (35), the connecting member may have an adhesive portion on the surface facing away from the contact portion, which is adhesive to the living body side.

[0077] In this case, since the connection member adheres to the living body side, it is possible to prevent the electrode sheet from peeling off from the living body side starting from the connection member.

[0078] (37): In a bioelectric potential measuring device according to any one of (1) to (36), the connecting member may have a connecting member side electrode that contacts the living body on a surface facing away from the contact portion, and the device may have a second contact portion that is connected to the connecting member side electrode.

[0079] In this case, the electrodes can be arranged in positions that overlap with the opposing portions of the connection members in a plan view, which improves the degree of freedom in arranging the electrodes.

[0080] (38): In the bioelectric potential measuring device according to any one of (1) to (37), the connection member may be integrated with the electrode sheet.

[0081] In this case, the bioelectric potential measuring device can be easily assembled.

[0082] (39): In the bioelectric potential measuring device according to any one of (1) to (38), the device may have a detachment mechanism for attaching and detaching the connecting member.

[0083] In this case, damage to the connection member when the electrode sheet is removed from the device can be suppressed.

[0084] (40): In the bioelectric potential measuring device of aspect (39), the detachment mechanism may include a movable member that is movable between an engaged position where it engages with the engaging portion and an unengaged position where it disengages from the engaged position, and a biasing member that biases the movable member from the unengaged position toward the engaged position.

[0085] In this case, the connecting member can be removed from the device by moving the moving member fitted in the fitting portion against the biasing force of the biasing member.

[0086] (41): In the bioelectric potential measuring device according to aspect (39) or (40), the attachment / detachment mechanism may include a button portion that is displaced in response to attachment / detachment of the connection member.

[0087] In this case, the connecting member can be removed from the device by displacing the button portion.

[0088] According to the above aspect of the present invention, it is possible to provide a biopotential measuring device that can reliably connect an electrode sheet to a device regardless of the size of the electrode sheet.

[0089] 1. A diagram showing an example of use of a biopotential measuring device according to the first embodiment. An exploded perspective view of a biopotential measuring device according to the first embodiment. A cross-sectional view along the short side of the biopotential measuring device according to the first embodiment. A perspective view of a connecting member according to the second embodiment. A perspective view of a connecting member according to the third embodiment. A perspective view of a connecting member according to the fourth embodiment. A perspective view of a biopotential measuring device according to the fifth embodiment. A perspective view of a biopotential measuring device according to the sixth embodiment. A cross-sectional view of a main part of a biopotential measuring device according to the sixth embodiment. A cross-sectional view of a main part of a biopotential measuring device according to the seventh embodiment. A simplified diagram of a biopotential measuring device according to the eighth embodiment. A simplified diagram of a biopotential measuring device according to the ninth embodiment. A plan view of an electrode sheet according to the tenth embodiment. A plan view of an electrode sheet according to the eleventh embodiment. A plan view of an electrode sheet according to a comparative example of the eleventh embodiment. A perspective view of a connecting member according to the twelfth embodiment. A perspective view of a connecting member according to the thirteenth embodiment. A schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the fourteenth embodiment. A plan view of an electrode sheet according to the fifteenth embodiment. A diagram showing an example of use of a biopotential measuring device according to the sixteenth embodiment. A schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the seventeenth embodiment. A schematic cross-sectional view along the longitudinal direction of an electrode sheet according to the eighteenth embodiment. FIG. 26 is a schematic cross-sectional view along the longitudinal direction of an electrode sheet according to the 19th embodiment. FIG. 27 is a simplified diagram of a biopotential measuring device according to the 20th embodiment. FIG. 28 is an exploded perspective view of a biopotential measuring device according to the 21st embodiment. FIG. 29 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the 22nd embodiment. FIG. 29 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the 23rd embodiment. FIG. 29 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the 24th embodiment. FIG. 29 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device according to the 25th embodiment. FIG. 29 is an exploded view of the biopotential measuring device shown in FIG. 29. FIG. 29 is a plan view of an electrode sheet according to the 26th embodiment. FIG. 29 is a plan view of an electrode sheet according to the 27th embodiment. FIG. 29 is a plan view of an electrode sheet according to the 28th embodiment. FIG. 29 is an exploded perspective view of a biopotential measuring device according to the 29th embodiment.

[0090] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0091] First Embodiment Fig. 1 is a diagram showing an example of use of a biopotential measurement device 1 according to a first embodiment. The biopotential measurement device 1 is attached to a living organism 100 and measures biosignals of the living organism 100. In the example shown in Fig. 1, the biopotential measurement device 1 is attached to the arm of the living organism 100 and measures, via the skin of the arm, myoelectric potentials generated when muscle cells contract. The biopotential measurement device 1 may also measure, for example, cardiac potentials as biosignals other than myoelectric potentials.

[0092] The biopotential measuring device 1 comprises an electrode sheet 10 that acquires biosignals, a device 20 that is connected to the electrode sheet 10, and a connecting member 30 that connects the electrode sheet 10 to the device 20. The electrode sheet 10 is formed in a substantially rectangular shape in a plan view. The surface of the electrode sheet 10 that faces the skin is an adhesive surface, allowing it to remain attached even during exercise. Furthermore, the entire biopotential measuring device 1 is small and lightweight to provide a low wearing sensation.

[0093] In the following description, an XYZ Cartesian coordinate system is set, and the positional relationship of each component is sometimes described with reference to this XYZ Cartesian coordinate system. The X-axis direction is set to the longitudinal direction of the electrode sheet 10. The Y-axis direction is set to the lateral direction of the electrode sheet 10. The Z-axis direction is set to the thickness direction of the electrode sheet 10.

[0094] Hereinafter, for convenience of explanation, the side of the electrode sheet 10 facing the device 20 may be referred to as the upper side (+Z side), and the side opposite the device 20 may be referred to as the lower side (-Z side) of the electrode sheet 10. Note that the +Z side does not have to be the upper side in the direction of gravity.

[0095] Fig. 2 is an exploded perspective view of the biopotential measurement device 1 according to the first embodiment. Fig. 3 is a cross-sectional view along the short side of the biopotential measurement device 1 according to the first embodiment. As shown in these figures, the biopotential measurement device 1 has a configuration in which an electrode sheet 10 is sandwiched between a device 20 and a connection member 30.

[0096] The electrode sheet 10 is, for example, a flexible printed wiring board, and has a sheet-like base material that is elastically deformable and electrically insulating. The base material of the electrode sheet 10 is formed from, for example, polyimide or urethane. The electrode sheet 10 has a plurality of conductive portions 11. The conductive portions 11 may be formed from transparent electrodes.

[0097] The plurality of conductive portions 11 include first to third electrode portions 11A to 11C and first to third wiring portions 12A to 12C. The first electrode portion 11A, the second electrode portion 11B, and the third electrode portion 11C are formed in a circular shape in a plan view seen from the Z-axis direction. The first electrode portion 11A, the second electrode portion 11B, and the third electrode portion 11C are arranged in a row at intervals in the longitudinal direction (X-axis direction) of the electrode sheet 10.

[0098] The first electrode portion 11A, the second electrode portion 11B, and the third electrode portion 11C are exposed on the lower surface side (-Z side) of the electrode sheet 10 and come into contact with the living body 100. The first electrode portion 11A, the second electrode portion 11B, and the third electrode portion 11C may be dry electrodes or wet electrodes. If they are wet electrodes, the first electrode portion 11A, the second electrode portion 11B, and the third electrode portion 11C come into contact with the skin with a medium such as gel interposed therebetween.

[0099] The first wiring portion 12A, the second wiring portion 12B, and the third wiring portion 12C are formed on the upper surface side (+Z side) of the electrode sheet 10. The first wiring portion 12A is connected to the first electrode portion 11A. The second wiring portion 12B is connected to the second electrode portion 11B. The third wiring portion 12C is connected to the third electrode portion 11C.

[0100] The electrode sheet 10 has a shape corresponding to the fitting portion 32 (described later) of the connection member 30. Specifically, the electrode sheet 10 has through holes 13 formed therein, through which the fitting portion 32 passes. The through holes 13 are formed in pairs spaced apart in the short-side direction. The through holes 13 are formed in the shape of slits extending in the X-axis direction.

[0101] The ends of the first wiring portion 12A, the second wiring portion 12B, and the third wiring portion 12C extend to between the pair of through holes 13. The ends of the first wiring portion 12A, the second wiring portion 12B, and the third wiring portion 12C are spaced apart in the Y-axis direction between the pair of through holes 13 and are alternately arranged in the X-axis direction. Specifically, the end of the third wiring portion 12C is located on the +X side relative to the ends of the first wiring portion 12A and the second wiring portion 12B. This prevents incorrect attachment of the electrode sheet 10 due to incorrect orientation. Note that the ends of the first wiring portion 12A, the second wiring portion 12B, and the third wiring portion 12C may be located at positions corresponding to three contact portions 21, which will be described later.

[0102] The device 20 has a contact portion 21 connected to the electrode sheet 10. The device 20 includes a substrate 22 on which the contact portion 21 is formed, a device case 23 that houses the substrate 22, and a device cover 24 (see FIG. 3) that covers the device case 23. The contact portion 21 protrudes downward (toward the -Z direction) from the underside of the substrate 22. This makes it easier to connect the contact portion 21 to the soft electrode sheet 10 (which is easily dissipated by pressure). The contact portion 21 has a dome shape with solder or the like provided on each terminal. The height of the contact portion 21 (the amount of protrusion relative to the substrate 22) is, for example, approximately 0.15 mm ± 0.05 mm.

[0103] As shown in FIG. 2, three contact portions 21 (first contact portion 21A to third contact portion 21C) are provided corresponding to the number and arrangement of the ends of the first wiring portion 12A, the second wiring portion 12B, and the third wiring portion 12C. Specifically, the first contact portion 21A is connected to the end of the first wiring portion 12A. The second contact portion 21B is connected to the end of the second wiring portion 12B. The third contact portion 21C is connected to the end of the third wiring portion 12C. Note that the ends of the wiring portions may be larger than the contact portions 21 on the XY plane. This makes it easier to accommodate misalignment of the electrode sheet 10 even if the device 20 is small.

[0104] The device 20 measures the myoelectric potential from the potential difference measured by two of the first to third electrode units 11A to 11C via the first to third contact units 21A to 21C. The device 20 also uses the potential measured by the remaining electrode unit of the first to third electrode units 11A to 11C as a reference to remove noise contained in the myoelectric potential. Specifically, assuming that the first and second electrode units 11A and 11B are measurement electrodes and the third electrode unit 11C is a reference electrode, the device 20 first calculates a first differential signal, which is the difference between the signals of the first electrode unit 11A and the third electrode unit 11C, and a second differential signal, which is the difference between the signals of the second electrode unit 11B and the third electrode unit 11C. Next, the device 20 calculates the difference between the first differential signal and the second differential signal. This allows components other than the target myoelectric potential to be removed. As another method, noise is removed from the signals measured by the first electrode unit 11A and the second electrode unit 11B by calculating the signal components that are commonly contained in the first electrode unit 11A and the second electrode unit 11B and applying a waveform of the opposite phase of that signal to the skin from the third electrode unit 11C. This allows the myoelectric potential obtained as the difference between the first electrode unit 11A and the second electrode unit 11B to be measured with noise removed.

[0105] The above processing is executed based on a pre-stored program by a CPU (Central Processing Unit), memory, input / output circuits, IC chips, and other electronic components provided on the board 22. Although not shown, the device 20 also includes a communication device that performs wireless communication with an external device, and a power supply unit that supplies power to each electronic component.

[0106] The device case 23 is, for example, a resin molded part, and is formed in a rectangular box shape as shown in Fig. 2. The upper side (+Z) of the device case 23 is open, and this opening is covered by a device cover 24 (see Fig. 3). As shown in Fig. 2, the device case 23 has a bottom surface 23a facing downward (-Z side), a pair of side wall surfaces 23b facing in the longitudinal direction (X-axis direction), and a pair of side wall surfaces 23c facing in the lateral direction (Y-axis direction).

[0107] An opening 25 extending in the short-side direction (Y-axis direction) is formed in the bottom surface 23a of the device case 23. A part of the substrate 22 housed in the device case 23 and the first contact portion 21A to the third contact portion 21C are exposed from the opening 25. The opening 25 forms gaps on both sides of the substrate 22 in the short-side direction (Y-axis direction) into which the fitting portion 32 of the connection member 30 can be inserted.

[0108] The bottom surface 23a of the device case 23 has inclined portions 26 formed by rounding off some corners of the opening edge on the +X side and −X side of the opening 25. The inclined portions 26 reduce the load (stress concentration) applied to the electrode sheet 10 from the opening edge of the opening 25 when the electrode sheet 10, the device 20, and the connection member 30 are assembled.

[0109] Engagement holes 27 (see FIG. 3 ) that engage with the device cover 24 are formed in the side wall surfaces 23b, 23c of the device case 23. Furthermore, protrusions 28 that protrude outward in the Y-axis direction are formed in the pair of side wall surfaces 23c facing the short side direction (Y-axis direction) near the opening 25. The protrusions 28 are formed with inclined surfaces 28a that are inclined toward the opening 25. The inclined surfaces 28a reduce the load (stress concentration) applied to the electrode sheet 10 from the corner where the bottom surface 23a and the side wall surfaces 23c intersect.

[0110] 3 , the connection member 30 sandwiches the electrode sheet 10 between the device 20 and the connection member 30, thereby connecting the conductive portion 11 of the electrode sheet 10 to the contact portion 21. The connection member 30 includes an opposing portion 31 that faces the contact portion 21 across the electrode sheet 10, a fitting portion 32 that fits into the device 20, and an extending portion 33 that extends laterally beyond the side end face of the electrode sheet 10 in the short direction (Y-axis direction).

[0111] The facing portion 31, the fitting portion 32, and the extending portion 33 are integrated by resin molding or the like. The connecting member 30 is preferably made of a material having spring properties, but may be made of a metal material as long as insulation with the electrode sheet 10 can be ensured. As shown in FIG. 2 , the facing portion 31 is formed in the shape of a rectangular flat plate extending along the Y-axis direction. The dimension of the facing portion 31 in the X-axis direction is set to a size that allows it to be inserted into the opening 25 of the device case 23. At least a portion of the facing portion 31 may be transparent. With this configuration, the connection status between the electrode sheet 10 and the contact portion 21 can be visualized.

[0112] The mating portions 32 are formed in pairs at both ends of the opposing portion 31 in the Y-axis direction. As shown in FIG. 3 , the mating portions 32 are formed in a generally inverted U-shape that protrudes upward (toward the +Z side). A mating claw 32a is formed on the side of the mating portion 32 facing outward in the Y-axis direction. The mating claw 32a has a shape similar to a corner formed by the hypotenuse and base of a right triangle. Note that the shape of the mating claw 32a is merely an example, and the lower surface (base) of the mating claw 32a may be changed to a slope to facilitate easier removal of the connection member 30 from the device 20.

[0113] The fitting portions 32 are elastically deformed inward in the Y-axis direction, thereby allowing the fitting claws 32a to move inward in the Y-axis direction. A pair of extension portions 33 are formed at the outer ends of the pair of fitting portions 32 in the Y-axis direction. The extension portions 33 are formed in a flat plate shape extending along the Y-axis direction. When the fitting portions 32 are fitted into the device 20, the extension portions 33 extend laterally beyond the side end faces in the short direction (Y-axis direction) of the electrode sheet 10.

[0114] As shown in Fig. 3, the device 20 has a mating portion 29 into which the mating portion 32 fits. The mating portion 29 is formed inside the opening 25 of the device case 23. Specifically, the mating portion 29 is formed on the inner surface of the portion of the side wall surface 23c where the protrusion 28 is formed. The mating portion 29 has a stepped shape that is recessed outward in the Y-axis direction. The mating portion 29 has a flat portion that abuts against the mating claw 32a in the Z-axis direction.

[0115] To assemble the biopotential measuring device 1 configured as above, first, as shown in Figure 2, the pair of fitting portions 32 of the connecting member 30 are inserted into the pair of through-holes 13 of the electrode sheet 10. This allows the electrode sheet 10 to be connected to the device 20 while the electrode sheet 10 is positioned. Next, the pair of fitting portions 32 that have penetrated the electrode sheet 10 are inserted into the openings 25 formed in the bottom surface 23a of the device case 23.

[0116] 3 , the pair of fitting portions 32 are elastically deformed inward in the Y-axis direction by the oblique side portions shown in FIG. 3 after passing through the opening 25. After passing through the opening 25, the pair of fitting portions 32 are restored to their original shape and fit into fitting portions 29 formed inside the opening 25. As a result, the connection member 30 is connected to the device 20 with the electrode sheet 10 sandwiched therebetween.

[0117] The opposing portion 31 of the connection member 30 connects the ends of the first to third wiring portions 12A to 12C of the conductive portion 11 to the first to third contact portions 21A to 21C of the device 20. The through holes 13 of the electrode sheet 10 are provided in pairs, and the first to third contact portions 21A to 21C are disposed between the pair of through holes 13 in a plan view. This prevents misalignment between the electrode sheet 10 and the contact portions 21. In other words, by designing the positional relationship between the through holes 13 and the fitting portion 32 with high precision, misalignment can be prevented. The gap between the through holes 13 and the fitting portion 32 is preferably narrower than the tolerance for misalignment between the ends of the first to third wiring portions 12A to 12C of the conductive portion 11 and the first to third contact portions 21A to 21C of the device 20. The tolerance for misalignment refers to the size of the gap that can ensure electrical continuity (connection) between the conductive portion 11 and the contact portion 21 .

[0118] Thus, according to the biopotential measuring device 1 of this embodiment, by sandwiching the electrode sheet 10 between the device 20 and the connecting member 30, the electrode sheet 10 can be reliably connected to the contact portion 21 of the device 20. Furthermore, because the electrode sheet 10 has a shape (through holes 13) that corresponds to the fitting portion 32 of the connecting member 30, there is no need to increase the size of the device 20 and the connecting member 30 to match the size of the electrode sheet 10.

[0119] As described above, the biopotential measuring device 1 according to this embodiment includes the electrode sheet 10 that acquires biosignals, the device 20 having the contact portion 21 connected to the electrode sheet 10, and the connection member 30 that connects the electrode sheet 10 to the contact portion 21 by sandwiching the electrode sheet 10 between the device 20 and the connection member 30, the connection member 30 having a fitting portion 32 that fits into the device 20, and the electrode sheet 10 has a shape that corresponds to the fitting portion 32. With this configuration, a biopotential measuring device 1 can be obtained that can reliably connect the electrode sheet 10 to the device 20 regardless of the size of the electrode sheet 10.

[0120] Furthermore, in the bioelectric potential measuring device 1 of this embodiment, the device 20 has a fitted portion 29 into which the fitting portion 32 fits. With this configuration, the connecting member 30 is less likely to come off the device 20.

[0121] Furthermore, in the biopotential measuring device 1 of this embodiment, the fitting portions 32 are provided in pairs in at least the short direction (Y-axis direction) of the electrode sheet 10. With this configuration, the device 20 can be made smaller in size in the longitudinal direction of the electrode sheet 10 than if the fitting portions 32 were provided in pairs in the longitudinal direction (X-axis direction) of the electrode sheet 10.

[0122] Furthermore, in the biopotential measuring device 1 of this embodiment, a plurality of contact points 21 are provided, and the connecting member 30 connects the electrode sheet 10 to the plurality of contact points 21. With this configuration, the electrode sheet 10 can be connected to the plurality of contact points 21 simultaneously.

[0123] Furthermore, the biopotential measuring device 1 of this embodiment is provided with a positioning mechanism that positions the electrode sheet 10 and the contact portion 21, and the positioning mechanism includes a fitting portion 32. With this configuration, the fitting portion 32 also serves as the positioning mechanism, so the number of parts in the biopotential measuring device 1 can be reduced.

[0124] Furthermore, in the biopotential measuring device 1 of this embodiment, the positioning mechanism includes through-holes 13 formed in the electrode sheet 10 corresponding to the fitting portions 32, through which the fitting portions 32 are disposed. With this configuration, the fitting portions 32 of the connection members 30 are inserted through the through-holes 13 formed in the electrode sheet 10 to fit into the device 20, allowing the outer shape of the electrode sheet 10 to be freely expanded.

[0125] Furthermore, in the biopotential measuring device 1 of this embodiment, a pair of through holes 13 are provided, and in plan view, the contact portion 21 is disposed between the pair of through holes 13. According to this configuration, the pair of fitting portions 32 of the connection member 30 are inserted into the pair of through holes 13 formed in the electrode sheet 10, thereby enabling the electrode sheet 10 to be positioned with high precision relative to the contact portion 21.

[0126] Furthermore, in the biopotential measuring device 1 of this embodiment, the connecting member 30 has an extension 33 that extends laterally beyond the side end surface of the electrode sheet 10 in the short direction of the electrode sheet 10. With this configuration, by hooking a finger on the extension 33, the biopotential measuring device 1 (particularly the electrode sheet 10 adhered to the skin) can be easily removed from the living body.

[0127] Furthermore, in the biopotential measuring device 1 of this embodiment, the electrode sheet 10 is a transparent electrode. According to this configuration, by making the electrode sheet 10 a transparent electrode, visibility is improved, making it easier to check for misalignment.

[0128] Second Embodiment Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0129] Fig. 4 is a perspective view of a connecting member 30 according to the second embodiment. As shown in Fig. 4, the connecting member 30 according to the second embodiment includes an elastic portion 34 in the facing portion 31. The elastic portion 34 may be made of, for example, a softer elastic material than the facing portion 31, such as rubber or elastomer. The elastic portion 34 may be disposed in an area that covers at least the first contact portion 21A to the third contact portion 21C of the device 20 (i.e., the ends of the first wiring portion 12A to the third wiring portion 12C of the electrode sheet 10).

[0130] As described above, the connecting member 30 of the second embodiment includes the elastic portion 34 in the opposing portion 31 that faces the contact portion 21 across the electrode sheet 10. With this configuration, the electrode sheet 10 can be reliably connected to the contact portion 21 by the pressure of the elastic portion 34.

[0131] Third Embodiment Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0132] FIG. 5 is a perspective view of a connecting member 30 according to a third embodiment. As shown in FIG. 5, the connecting member 30 according to the third embodiment includes a protrusion 35 on the facing portion 31. The protrusion 35 protrudes upward (toward the +Z side) toward the electrode sheet 10. The protrusion 35 has a flat portion at the center in the Y-axis direction, and is formed in a semicircular or dome shape that gently slopes outward in the Y-axis direction from the flat portion. The flat portion of the protrusion 35 only needs to be positioned in a range that covers at least the first contact portion 21A to the third contact portion 21C of the device 20 (i.e., the ends of the first wiring portion 12A to the third wiring portion 12C of the electrode sheet 10).

[0133] As described above, the connecting member 30 of the third embodiment includes a protrusion 35 that protrudes toward the electrode sheet 10 on the opposing portion 31 that faces the contact portion 21 across the electrode sheet 10. With this configuration, the electrode sheet 10 can be reliably connected to the contact portion 21 by the pressure applied by the protrusion 35.

[0134] Fourth Embodiment Next, a fourth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0135] 6 is a perspective view of a connecting member 30 according to the fourth embodiment. As shown in FIG. 6, the connecting member 30 according to the fourth embodiment includes a recess 36 in the facing portion 31. The recess 36 is recessed toward the side opposite the electrode sheet 10 (the -Z side). The recess 36 is formed in a rectangular groove shape when viewed from the Z-axis direction. The recess 36 only needs to be disposed in an area that covers at least the first contact portion 21A to the third contact portion 21C of the device 20 (i.e., the ends of the first wiring portion 12A to the third wiring portion 12C of the electrode sheet 10).

[0136] As described above, the connecting member 30 of the fourth embodiment includes a recess 36 recessed toward the side opposite the electrode sheet 10 in the opposing portion 31 that faces the contact portion 21 across the electrode sheet 10. According to this configuration, the recess 36 can prevent the electrode sheet 10 from being pressed with excessive force against the contact portion 21 that protrudes from the substrate 22.

[0137] Fifth Embodiment Next, a fifth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0138] Fig. 7 is a perspective view of a biopotential measurement device 1 according to a fifth embodiment. Note that the electrode sheet 10 is not shown in Fig. 7 to improve the visibility of the connection member 30. As shown in Fig. 7, in the biopotential measurement device 1 of the fifth embodiment, the movable connection member 30 is integrated with the device 20.

[0139] 7 includes a rotation shaft 38 that is journaled to the device case 23. The rotation shaft 38 protrudes from the +Y side end of the connection member 30 on both sides in the X axis direction. A bearing hole into which the rotation shaft 38 is inserted is formed in the device case 23 near the +Y side end of the opening 25. This allows the connection member 30 to be integrated with the device 20 so as to be rotatable around an axis extending in the X axis direction.

[0140] In addition to the rotation shaft 38, the connecting member 30 includes the aforementioned facing portion 31, fitting portion 32, and extending portion 33. The extending portion 33 is formed on the opposite side (only one side) of the connecting member 30 from the rotation shaft 38. The extending portion 33 and the facing portion 31 are connected at two locations on either side of a slit 37 formed in the connecting member 30. The slit 37 is formed at a position corresponding to the fitting portion 32.

[0141] As described above, in the bioelectric potential measuring device 1 of the fifth embodiment, the movable connecting member 30 is integrated with the device 20. With this configuration, the device 20 and the connecting member 30 are integrated, which can prevent the connection member 30 from being lost. Furthermore, since the device 20 and the connecting member 30 are connected along a predetermined track, the stability of the connection between the device 20 and the connecting member 30 can be improved.

[0142] Sixth Embodiment Next, a sixth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0143] Fig. 8 is a perspective view of a biopotential measurement device 1 according to a sixth embodiment. Note that the electrode sheet 10 is not shown in Fig. 8 to improve visibility of the connection member 30. Fig. 9 is a cross-sectional view of a main part of the biopotential measurement device 1 according to the sixth embodiment. As shown in these figures, in the biopotential measurement device 1 of the sixth embodiment, the connection member 30 is separably integrated with the device 20.

[0144] An insertion hole 40 into which the rotation shaft 38 is inserted is formed in the device case 23 near the end on the +Y side of the opening 25. As shown in Fig. 9, the insertion hole 40 includes an insertion portion 41 and an engagement portion 42. The insertion portion 41 extends linearly in the Z-axis direction from the bottom surface 23a of the device case 23. The engagement portion 42 is bent at a right angle to the insertion portion 41 and extends linearly in the Y-axis direction.

[0145] The rotation shaft 38 moves in the Z-axis direction and the Y-axis direction and engages with an insertion hole 40 that is L-shaped in cross section. This allows the connection member 30 to be integrated with the device 20 and rotatable about an axis extending in the X-axis direction. When removing the connection member 30 from the device 20, conversely, the connection member 30 is moved in the Y-axis direction and the Z-axis direction, and the rotation shaft 38 is pulled out of the insertion hole 40 that is L-shaped in cross section.

[0146] As described above, in the bioelectric potential measuring device 1 of the sixth embodiment, the connection member 30 is detachably integrated with the device 20. With this configuration, the connection member 30 can be removed from the device 20 when not in use. Furthermore, since the device 20 and the connection member 30 can be integrated when in use, the connection stability between the device 20 and the connection member 30 can be improved.

[0147] Seventh Embodiment Next, a seventh embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0148] Fig. 10 is a cross-sectional view of a main part of the bioelectric potential measuring device 1 according to the seventh embodiment. Fig. 10 is a cross-sectional view of the same part as Fig. 9 described above. As shown in Fig. 10, a pair of protrusions 43 are formed in the insertion hole 40 of the seventh embodiment.

[0149] The insertion hole 40 shown in Figure 10 is not bent into an L shape, but extends linearly in the Z-axis direction. A pair of protrusions 43 are formed on the inner wall surfaces of the insertion hole 40 that face each other in the Y-axis direction. The gap between the pair of protrusions 43 is slightly narrower than the diameter of the rotating shaft 38. This prevents the rotating shaft 38 from easily slipping out of the insertion hole 40 once it has passed through the pair of protrusions 43.

[0150] As described above, in the bioelectric potential measuring device 1 of the seventh embodiment, the connecting member 30 is detachably integrated with the device 20. With this configuration, the connecting member 30 can be removed from the device 20 when not in use. Furthermore, when in use, the device 20 and the connecting member 30 can be connected in a predetermined trajectory, thereby improving the stability of the connection between the device 20 and the connecting member 30.

[0151] Eighth Embodiment Next, an eighth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0152] Fig. 11 is a simplified diagram of a biopotential measuring device 1 according to an eighth embodiment. Fig. 11(a) shows a state before the conductive portion 11 of the electrode sheet 10 is connected to the contact portion 21 of the device 20. Fig. 11(b) shows a state after the conductive portion 11 of the electrode sheet 10 is connected to the contact portion 21 of the device 20. As shown in Fig. 11 , the connecting member 30 according to the eighth embodiment is provided with a contact portion 50 that contacts the device 20 via a portion of the electrode sheet 10 that does not overlap with the contact portion 21 (the portion of the sheet base other than the conductive portion 11).

[0153] The contact portion 50 is formed in a convex shape that protrudes from the opposing portion 31 of the connection member 30 toward the device 20. The tip surface of the contact portion 50 is flat. As shown in FIG. 11( b ), the contact portion 50 comes into contact with the device 20 via the sheet base material portion of the electrode sheet 10 when sandwiched between the device 20 and the connection member 30.

[0154] In this way, the connecting member 30 (one side) of the eighth embodiment is provided with an abutting portion 50 that abuts against the device 20 (the other side) via a portion of the electrode sheet 10 that does not overlap with the contact portion 21. With this configuration, the abutting portion 50 acts as a spacer, preventing excessive force from being applied to the contact portion 21. The abutting portion 50 may be provided on both sides of the connecting member 30 and the device 20, or, if the contact portion 21 does not protrude downward and, conversely, the conductive portion 11 protrudes upward from the electrode sheet 10, the abutting portion 50 may be provided only on the device 20 side.

[0155] Ninth Embodiment Next, a ninth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0156] Fig. 12 is a simplified diagram of a bioelectric potential measuring device 1 according to the ninth embodiment. As shown in Fig. 12, the contact portion 50 of the ninth embodiment has a curved corner 51. Specifically, the corner 51 where the tip surface and the side wall surface of the contact portion 50 intersect is formed in an arc shape in a vertical cross section of the contact portion 50.

[0157] As described above, the contact portion 50 of the ninth embodiment has the curved corners 51. With this configuration, the load (stress concentration) applied to the electrode sheet 10 from the corners 51 of the contact portion 50 can be reduced.

[0158] Tenth Embodiment Next, a tenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0159] Fig. 13 is a plan view of the electrode sheet 10 according to the tenth embodiment. As shown in Fig. 13, the electrode sheet 10 according to the tenth embodiment has constricted portions 15. Specifically, the constricted portions 15 are formed in pairs at the outer edges of the electrode sheet 10 in the short-side direction (Y-axis direction).

[0160] The electrode sheet 10 has a plurality of conductive portions 11. The conductive portions 11 include terminal portions (first terminal portion 14A to third terminal portion 14C) that contact contact portions 21 (not shown in FIG. 13 ) of the device 20, electrode portions (first electrode portion 11A to third electrode portion 11C) that contact the living body side, and wiring portions (first wiring portion 12A to third wiring portion 12C) that connect the terminal portions and the electrode portions. The first terminal portion 14A to third terminal portion 14C are arranged between a pair of constricted portions 15.

[0161] The fitting portion 32 of the connection member 30 is inserted in the Z-axis direction into the constricted portion 15. The constricted portion 15, together with the fitting portion 32, constitutes a positioning mechanism that positions the electrode sheet 10 relative to the device 20. With this configuration, even if the width of the electrode sheet 10 is narrow and the above-mentioned through-holes 13 (see FIG. 2 ) cannot be formed, the electrode sheet 10 can be positioned relative to the contact portions 21 by the constricted portion 15.

[0162] Furthermore, the first terminals 14A to 14C are elongated in a second direction (X-axis direction) that intersects with the first direction (Y-axis direction). With this configuration, extending the first terminals 14A to 14C in the second direction (X-axis direction) in which the expansion and contraction of the electrode sheet 10 is not restricted by the pair of fitting portions 32 can stabilize the connection between the first terminals 14A to 14C and the first contacts 21A to 21C. Furthermore, the second direction that intersects with the first direction is not limited to a direction that intersects with the first direction at a right angle, and includes, for example, a direction that intersects with the first direction at an angle of 60° or more and 120° or less.

[0163] Eleventh Embodiment Next, an eleventh embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0164] Fig. 14 is a plan view of an electrode sheet 10 according to an eleventh embodiment. As shown in Fig. 14, the electrode sheet 10 of the eleventh embodiment has a plurality of conductive portions 11, and a terminal group 140 including a plurality of terminal portions (first terminal portion 14A to third terminal portion 14C) and an electrode group 110 including a plurality of electrode portions (first electrode portion 11A to third electrode portion 11C) are arranged spaced apart from each other in a plan view. In other words, the eleventh embodiment does not have a configuration in which the first terminal portion 14A to third terminal portion 14C are arranged between the second electrode portion 11B and the third electrode portion 11C, as shown in Fig. 13.

[0165] According to this configuration, the electrode group 110 connected to the living body side is positioned away from the terminal group 140 connected to the device 20 side by the connecting member 30, thereby preventing the electrode group 110 from peeling off from the living body side. That is, the electrode sheet 10 is more likely to peel off near the terminal group 140 due to the effect of the electrode sheet 10 floating away from the living body side caused by the thickness of the connecting member 30 in the Z-axis direction. Therefore, by separating the electrode group 110 from the terminal group 140, it is possible to prevent the electrode group 110 from peeling off from the living body side.

[0166] In addition, in the electrode group 110, the multiple electrode portions (first electrode portion 11A to third electrode portion 11C) are arranged linearly in the X-axis direction, and the terminal group 140 is arranged on an extension of the multiple electrode portions (first electrode portion 11A to third electrode portion 11C) in the X-axis direction. This configuration allows the electrode sheet 10 to be made smaller.

[0167] Fig. 15 is a plan view of an electrode sheet 10 according to a comparative example of the eleventh embodiment. In the electrode sheet 10 shown in Fig. 15, the terminal group 140 is not arranged on an extension line of the multiple electrode portions (first electrode portion 11A to third electrode portion 11C). In this case, the size of the electrode sheet 10 is larger than that of the electrode sheet 10 shown in Fig. 14. However, there is an advantage in that the separation between the electrode group 110 and the terminal group 140 reduces the effect of peeling from the living body side due to the thickness of the connection member 30 in the Z-axis direction.

[0168] Twelfth Embodiment Next, a twelfth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0169] Fig. 16 is a perspective view of a connecting member 30 according to the twelfth embodiment. As shown in Fig. 16, the connecting member 30 according to the twelfth embodiment has a pair of first fitting portions 32A provided in the short-side direction (Y-axis direction) of the electrode sheet 10, and a second fitting portion 32B that fits into the device 20 at a position different from the first fitting portion 32A.

[0170] 16 is provided parallel to the first fitting portion 32A. This configuration increases the number of fitting points with the device 20, thereby increasing the stability of the fitting of the connecting member 30. In other words, the connecting member 30 becomes less likely to come off the device 20.

[0171] Thirteenth Embodiment Next, a thirteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0172] Fig. 17 is a perspective view of a connecting member 30 according to the thirteenth embodiment. As shown in Fig. 17, the second fitting portion 32B of the thirteenth embodiment is provided in a different orientation from the first fitting portion 32A.

[0173] Specifically, the second fitting portion 32B is provided facing the longitudinal direction (X-axis direction) of the electrode sheet 10. By fitting this second fitting portion 32B into the device 20, when a force is applied around an axis extending in the lateral direction (Y-axis direction) of the electrode sheet 10, with the first fitting portion 32A as the axis, for example, when a finger is placed on the end of the device 20 in the longitudinal direction (X-axis direction) during vigorous exercise, the rotation of the device 20 can be restricted by the fitting of the second fitting portion 32B.

[0174] Fourteenth Embodiment Next, a fourteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0175] 18 is a schematic cross-sectional view along the longitudinal direction of the biopotential measuring device 1 according to the fourteenth embodiment. As shown in Fig. 18, the second fitting portion 32B of the fourteenth embodiment slides in the longitudinal direction (X-axis direction) of the electrode sheet 10 as indicated by the arrow in the figure, and fits into the device 20.

[0176] Specifically, device 20 includes first fitted portion 29A (fitted portion 29 shown in FIG. 3 ) into which first fitting portion 32A fits, and second fitted portion 29B into which second fitting portion 32B fits. Second fitted portion 29B is formed in an inverted L shape. Electrode sheet 10 includes first through hole 13A (same as through hole 13 shown in FIG. 3 ) into which first fitting portion 32A passes, and second through hole 13B into which second fitting portion 32B passes.

[0177] According to this configuration, the second fitting portion 32B can be fitted into the second fitted portion 29B by inserting the second fitting portion 32B into the second fitted portion 29B and sliding it in the longitudinal direction (X-axis direction) of the electrode sheet 10. Thereafter, the first fitting portion 32A can be fitted into the first fitted portion 29A by rotating the connecting member 30 around the second fitting portion 32B fitted into the second fitted portion 29B as a fulcrum.

[0178] In the configurations shown in Figures 16 and 17 described above, the first engaging portion 32A and the second engaging portion 32B need to be bent simultaneously to engage with the device 20, but in the configuration shown in Figure 18, the second engaging portion 32B can be engaged with the device 20 separately from the first engaging portion 32A, making it easier to engage the connecting member 30 with the device 20.

[0179] Fifteenth Embodiment Next, a fifteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0180] Fig. 19 is a plan view of an electrode sheet 10 according to a fifteenth embodiment. As shown in Fig. 19, the electrode sheet 10 of the fifteenth embodiment includes a shape-retaining portion 16 that is harder than the base material.

[0181] For example, if the base material of the electrode sheet 10 is formed from a soft urethane sheet, the shape-retaining portion 16 is formed from a polyimide film or a PET film, which is harder than the urethane sheet. The shape-retaining portion 16 is disposed near the contact portion 21 of the device 20, and has openings that expose the terminal portions (first terminal portion 14A to third terminal portion 14C) and the through-holes 13. This configuration can suppress twisting and deformation of the electrode sheet 10 near the contact portion 21 of the device 20, thereby stabilizing the positioning of the electrode sheet 10 and the contact portion 21. Note that the shape-retaining portion 16 may be thicker and harder than the base material of the electrode sheet 10.

[0182] Sixteenth Embodiment Next, a sixteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0183] Fig. 20 is a diagram showing an example of use of the biopotential measurement device 1 according to the sixteenth embodiment. As shown in Fig. 20, in the biopotential measurement device 1 according to the sixteenth embodiment, the connection member 30 is disposed inside the outer edge of the electrode sheet 10 in a plan view.

[0184] That is, in the sixteenth embodiment, the entire connecting member 30 is covered by the electrode sheet 10, and unlike the first embodiment shown in Fig. 1, the extending portion 33 does not protrude from the electrode sheet 10. With this configuration, even during strenuous exercise, fingers or the like are less likely to get caught on the connecting member 30 (extending portion 33), reducing the probability that the bioelectric potential measuring device 1 will unintentionally come off from the living body 100.

[0185] Seventeenth Embodiment Next, a seventeenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0186] 21 is a schematic cross-sectional view along the longitudinal direction of the biopotential measurement device 1 according to the seventeenth embodiment. As shown in Fig. 21, the biopotential measurement device 1 according to the seventeenth embodiment includes an adhesive portion 60 on the living body side of the connecting member 30.

[0187] The adhesive portion 60 is applied to the surface of the connecting member 30 facing away from the contact portion 21. There are no particular limitations on the material of the adhesive portion 60 as long as it can adhere the connecting member 30 to the living body side. With this configuration, not only the electrode sheet 10 but also the connecting member 30 can adhere to the living body side, so peeling of the electrode sheet 10 from the living body side starting from the connecting member 30 can be suppressed.

[0188] Eighteenth Embodiment Next, an eighteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0189] Fig. 22 is a schematic cross-sectional view along the longitudinal direction of the electrode sheet 10 according to the 18th embodiment. As shown in Fig. 22, in the electrode sheet 10 according to the 18th embodiment, a hardened layer 14a is formed on the surfaces of the terminal portions (first terminal portion 14A (not shown), second terminal portion 14B, and third terminal portion 14C).

[0190] The hardened layer 14a is harder than the wiring portions (first wiring portion 12A to third wiring portion 12C). The hardened layer 14a may be formed by modifying the surfaces of the terminal portions (first terminal portion 14A to third terminal portion 14C), or may be formed by coating with an organic conductive material such as carbon or by metal deposition. With this configuration, the hardened surfaces of the terminal portions enable reliable connection with the contact portions 21, thereby stabilizing the connection between the terminal portions and the contact portions 21.

[0191] Nineteenth Embodiment Next, a nineteenth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0192] Fig. 23 is a schematic cross-sectional view along the longitudinal direction of the electrode sheet 10 according to the 19th embodiment. As shown in Fig. 23, the electrode sheet 10 according to the 19th embodiment has softened layers 14b formed on the surfaces of the terminal portions (first terminal portion 14A (not shown), second terminal portion 14B, and third terminal portion 14C).

[0193] The softening layer 14b has a hardness equal to or less than that of the wiring portions (first wiring portion 12A to third wiring portion 12C). The softening layer 14b may be the terminal portions (first terminal portion 14A to third terminal portion 14C) themselves, may be formed by modifying the surfaces of the terminal portions, or may be formed by coating with an organic conductive material such as conductive rubber or by metal deposition. With this configuration, the surfaces of the terminal portions become soft, allowing them to deform in accordance with the contact portions 21, thereby stabilizing the connection between the terminal portions and the contact portions 21.

[0194] Twentieth Embodiment Next, a twentieth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0195] Fig. 24 is a simplified diagram of a biopotential measurement device 1 according to a twentieth embodiment. Fig. 24 is a simplified diagram corresponding to Fig. 12 described above. As shown in Fig. 24, in the biopotential measurement device 1 of the twentieth embodiment, the contact portion 21 has a curved corner 21a. Specifically, the corner 21a where the lower end surface and the side surface of the contact portion 21 intersect is formed in an arc shape in a vertical cross section along the up-down direction of the contact portion 21.

[0196] In this way, the contact portion 21 of the twentieth embodiment has the curved corners 21 a. With this configuration, it is possible to reduce the load (stress concentration) applied to the electrode sheet 10 from the corners 21 a of the contact portion 21.

[0197] 21st Embodiment Next, a 21st embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0198] Fig. 25 is an exploded perspective view of a biological potential measurement device 1 according to the 21st embodiment. As shown in Fig. 25, the biological potential measurement device 1 according to the 21st embodiment has a connection member 30 provided with a connection member side electrode 11' that comes into contact with the living body side.

[0199] 25 includes an electrode portion 11B' corresponding to the second electrode portion 11B described above, a wiring portion 12B' corresponding to the second wiring portion 12B described above, and a terminal portion 14B' corresponding to the second terminal portion 14B described above. The electrode portion 11B' is disposed on the living body side (-Z side) of the facing portion 31. The terminal portion 14B' is disposed on the device side (+Z side) of the facing portion 31. The wiring portion 12B' penetrates the facing portion 31 in the Z-axis direction and connects the electrode portion 11B' and the terminal portion 14B'.

[0200] The device 20 includes a second contact portion 21B' connected to the connection member side electrode 11'. A through hole 13' is formed in the electrode sheet 10 to bring the second contact portion 21B' into contact with the terminal portion 14B'. With this configuration, the electrode portion 11B' can be arranged in a position that overlaps the opposing portion 31 of the connection member 30 in a plan view, thereby improving the degree of freedom in arranging the electrode portion 11B'.

[0201] 22nd Embodiment Next, a 22nd embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0202] 26 is a schematic cross-sectional view along the longitudinal direction of the biopotential measurement device 1 according to the 22nd embodiment. As shown in FIG. 26, the biopotential measurement device 1 according to the 22nd embodiment includes an attachment / detachment mechanism 70 for attaching and detaching the connection member 30 to the device 20.

[0203] Specifically, the connection member 30 includes a fitting portion 32C having a through hole 39 formed therein that penetrates in the X-axis direction. The device 20 has an insertion hole 20a formed therein that extends in the X-axis direction from the side surface on the +X side of the device 20 toward the space in which the fitting portion 32C is disposed. The insertion hole 20a is formed to penetrate the space in which the fitting portion 32C is disposed.

[0204] A rod-shaped movable member 72 movable in the X-axis direction is inserted into the insertion hole 20a. The movable member 72 is inserted into the through-hole 39 of the fitting portion 32C within the opening 25. With this configuration, the connection member 30 can be easily attached and detached from the device 20 by inserting and removing the movable member 72 from the device 20. Therefore, less force is required to remove the electrode sheet 10 from the device 20 than when the claw-shaped fitting portion 32 is elastically deformed as shown in FIG. 2, and damage to the connection member 30 can be suppressed.

[0205] 23rd Embodiment Next, a 23rd embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0206] Fig. 27 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device 1 according to the 23rd embodiment. As shown in Fig. 27, the attachment / detachment mechanism 70 of the 23rd embodiment includes a moving member 72 that is movable between an engagement position 72A where it engages with the engagement portion 32C and a non-engagement position 72B where it disengages from the engagement position 72A, and a biasing member 73 that biases the moving member 72 from the non-engagement position 72B toward the engagement position 72A.

[0207] Specifically, the moving member 72 has a flange 72a against which the biasing member 73 abuts. The biasing member 73 biases the flange 72a toward the fitting portion 32C side (-X side) inside the device 20. An example of the biasing member 73 is a coil spring, but it may be a spring other than a coil spring, or may be an elastic body such as rubber.

[0208] According to this configuration, the moving member 72 engaged with the engaging portion 32C can be removed from the through-hole 39 of the engaging portion 32C by moving the moving member 72 from the engaged position 72A to the non-engaged position 72B against the biasing force of the biasing member 73. This allows the connection member 30 to be easily removed from the device 20.

[0209] When attaching the connection member 30 to the device 20, the moving member 72 is pulled to move it to the non-engaged position 72B, and the engaging portion 32C is inserted into the opening 25 of the device 20. Thereafter, by releasing the moving member 72, the biasing force of the biasing member 73 allows the moving member 72 to be inserted into the through-hole 39 of the engaging portion 32C.

[0210] 24th Embodiment Next, a 24th embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0211] 28 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device 1 according to the 24th embodiment. As shown in Fig. 28, the attachment / detachment mechanism 70 of the 24th embodiment includes a button portion 74 that is displaced in response to attachment / detachment of the connection member 30.

[0212] Specifically, the button portion 74 is provided on the upper surface of the device 20. The lower end of the button portion 74 extends into the opening 25 of the device 20 and faces the fitting portion 32D of the connection member 30 in the up-down direction (Z-axis direction). The fitting portion 32D fits into a fitted portion 29D of the device 20. The fitted portion 29D has an elastically deformable claw shape.

[0213] According to this configuration, by pressing the button portion 74 downward, the mated portion 29D mated with the mating portion 32D is elastically deformed, and the mating portion 32D can be moved downward below the mated portion 29D. In this way, by displacing the button portion 74, the connection member 30 can be easily removed from the device 20.

[0214] Furthermore, when attaching the connecting member 30 to the device 20, the engaging portion 32D can be inserted into the opening 25 of the device 20, causing the engaged portion 29D to elastically deform, thereby moving the engaging portion 32D above the engaged portion 29D. At this time, the button portion 74 is pushed up by the engaging portion 32D and displaced upward, allowing the user to confirm from the outside that the connecting member 30 is in the engaged state.

[0215] 25th Embodiment Next, a 25th embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0216] Fig. 29 is a schematic cross-sectional view along the longitudinal direction of a biopotential measuring device 1 according to the 25th embodiment. Fig. 30 is an exploded view of the biopotential measuring device 1 shown in Fig. 29. As shown in Figs. 29 and 30, the electrode sheet 10 of the 25th embodiment has a bent portion 17.

[0217] 30 , cutouts 18 are formed in the electrode sheet 10. The cutouts 18 have, for example, an H-shape or an S-shape in plan view, and the bent portions 17 are formed by cutting and raising parts of the electrode sheet 10 so as to face each other in the X-axis direction. The bent portions 17 are provided with terminals (a first terminal 14A (not shown), a second terminal 14B, and a third terminal 14C).

[0218] The device 20 has a housing portion 80. The housing portion 80 is open to the bottom surface of the device 20. Contact portions 21 (first contact portion 21A (not shown), second contact portion 21B, and third contact portion 21C) are provided on portions of a side wall portion 81 of the housing portion 80 that face each other in the X-axis direction.

[0219] 29 , the connection member 30 can be accommodated in the accommodation portion 80. The connection member 30 has a rectangular block-shaped fitting portion 32E that fits into the accommodation portion 80, and connects the terminal portions (first terminal portion 14A (not shown), second terminal portion 14B, third terminal portion 14C) and the contact portions 21 (first contact portion 21A (not shown), second contact portion 21B, third contact portion 21C).

[0220] Thus, in the 25th embodiment, the device 20 has a housing 80 in which the connection member 30 (fitting portion 32E) is housed. The housing 80 has a side wall 81 on which the contact portion 21 is disposed. The electrode sheet 10 has a bent portion 17 sandwiched between the side wall 81 and the fitting portion 32E within the housing 80, and the bent portion 17 is provided with a terminal portion connected to the contact portion 21. With this configuration, the connection member 30 does not need to be disposed on the living body side (-Z side) of the electrode sheet 10, making it less likely for the electrode sheet 10 to float and preventing the electrode sheet 10 from peeling off from the living body side. Note that the contact portion 21 may be located on the top wall surface of the housing 80 facing the -Z side, rather than on the side wall 81 of the housing 80. Even in this case, the connection member 30 (fitting portion 32E) can be fitted into the housing 80 to connect the contact portion 21 and the terminal portion. According to this configuration, the connection member 30 does not need to protrude into the living body, thereby reducing the discomfort felt by the living body.

[0221] 26th Embodiment Next, a 26th embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0222] Fig. 31 is a plan view of an electrode sheet 10 according to a 26th embodiment. As shown in Fig. 31, the electrode sheet 10 according to the 26th embodiment is integrated with a connecting member 30.

[0223] The connecting member 30 is integrated with the electrode sheet 10, for example, with an adhesive. This configuration reduces the number of parts in the biopotential measuring device 1, making it easier to assemble the biopotential measuring device 1. The fitting portion 32 of the connecting member 30 also functions as a restricting portion that restricts deformation of the electrode sheet 10 in the first direction (Y-axis direction). This configuration restricts expansion and contraction of the electrode sheet 10 in the first direction, thereby stabilizing the connection between the first terminal 14A and the first contact 21A (not shown). Although not shown in FIG. 31 , the same effect can be achieved with the second terminal 14B and the third terminal 14C.

[0224] 27th Embodiment Next, a 27th embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0225] Fig. 32 is a plan view of an electrode sheet 10 according to the 27th embodiment. As shown in Fig. 32, the electrode portions 11A of the 27th embodiment are separated in the second direction (X-axis direction). With this configuration, stress is less likely to be applied to the electrode portions 11A when the electrode sheet 10 expands or contracts in the second direction (X-axis direction). The separated electrode portions 11A are connected by connection wiring 19.

[0226] 28th Embodiment Next, a 28th embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0227] Fig. 33 is a plan view of an electrode sheet 10 according to the 28th embodiment. As shown in Fig. 33 , in the electrode sheet 10 according to the 28th embodiment, the second electrode portion 11B is disposed at a distance D1 from the connecting member 30, and the third electrode portion 11C is disposed at a distance D2 from the connecting member 30.

[0228] Specifically, distance D1 is greater than the thickness in the Z-axis direction of the facing portion 31 of the connecting member 30 shown in Fig. 2 . Similarly, distance D2 is greater than the thickness in the Z-axis direction of the facing portion 31 of the connecting member 30. This configuration can prevent the second electrode portion 11B and the third electrode portion 11C from peeling off due to the effect of the electrode sheet 10 floating from the living body side caused by the thickness of the facing portion 31. Note that, because the first electrode portion 11A is disposed farther away from the connecting member 30 than the second electrode portion 11B, the effect of the floating caused by the thickness of the facing portion 31 is small.

[0229] Twenty-ninth Embodiment Next, a twenty-ninth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0230] Fig. 34 is an exploded perspective view of a biopotential measurement device 1 according to the 29th embodiment. As shown in Fig. 34, in the biopotential measurement device 1 according to the 29th embodiment, a fitting portion 91 is provided on the device 20 side, and a fitted portion 90 is provided on the connection member 30.

[0231] Specifically, the mating portions 90 are a pair of through holes formed in the opposing portion 31 of the connection member 30. The mating portions 91 are a pair of claws that can be inserted into and mated with the mating portions 90, and are formed on the device 20. The pair of mating portions 91 pass through a pair of through holes 13 in the electrode sheet 10 and mated with the mating portions 90. This configuration also allows the electrode sheet 10 to be connected to the contact portion 21.

[0232] While preferred embodiments of the present invention have been described and illustrated, it should be understood that these are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Accordingly, the present invention should not be deemed limited by the foregoing description, but rather by the scope of the claims.

[0233] Furthermore, for example, in the above embodiment, a configuration in which the connection member 30 is rotatably integrated with the device 20 has been exemplified, but the connection member 30 may also be slidably integrated with the device 20 .

[0234] REFERENCE SIGNS LIST 1 Bioelectric potential measuring device 10 Electrode sheet 11 Conductive portion 11A First electrode portion 11B Second electrode portion 11C Third electrode portion 11' Connection member side electrode 12 Wiring portion 12A First wiring portion 12B Second wiring portion 12C Third wiring portion 13 Through hole 13A First through hole 13B Second through hole 14a Hardened layer 14A First terminal portion 14b Softened layer 14B Second terminal portion 14C Third terminal portion 15 Narrowed portion 16 Shape-retaining portion 17 Bent portion 18 Notched portion 19 Connection wiring 20 Device 20a Insertion hole 21 Contact portion 21a Corner portion 21A First contact portion 21B Second contact portion 21C Third contact portion 22 Substrate 23 Device case 23a Bottom surface 23b Side wall surface 23c Side wall surface 24 Device cover 25 Opening 26 Inclined portion 27 Engagement hole 28 Protruding portion 28a Inclined surface 29 Engaged portion 29A First engaged portion 29B Second engaged portion 29D Engaged portion 30 Connecting member 31 Opposing portion 32 Engaging portion 32a Engaging claw 32A First engaged portion 32B Second engaged portion 32C Engaging portion 32D Engaging portion 32E Engaging portion 33 Extension portion 34 Elastic portion 35 Convex portion 36 Concave portion 37 Slit 38 Rotation shaft 39 Through hole 40 Insertion hole 41 Insertion portion 42 Engaging portion 43 Protruding portion 50 Contact portion 51 Corner portion 60 Adhesive portion 70 Attachment / detachment mechanism 72 Moving member 72a Flange 72A Engaged position 72B Unengaged position 73 Urging member 74 Button portion 80 Storage portion 81 Side wall portion 90 Engaged portion 91 Engaged portion 100 Living body 110 Electrode group 140 Terminal group D1 Distance D2 Distance

Claims

1. an electrode sheet for acquiring biosignals; a device having a contact portion connected to the electrode sheet; a connection member that connects the electrode sheet to the contact portion by sandwiching the electrode sheet between the connection member and the device; a positioning mechanism for positioning the electrode sheet and the contact portion, The positioning mechanism includes: a fitting portion provided on the connection member and fitted to the device; a constricted portion formed on an outer edge of the electrode sheet in correspondence with the fitting portion, and in which the fitting portion is disposed; the device has a contact group including a plurality of the contact portions, The constricted portions are provided in pairs, In a plan view, the contact group is disposed between the pair of constricted portions. Bioelectric potential measuring device.

2. the device has a mating portion into which the mating portion is mated; The bioelectric potential measuring device according to claim 1 .

3. The fitting portion is provided in a pair in at least the short side direction of the electrode sheet. The bioelectric potential measuring device according to claim 1 or 2.

4. The fitting portion is a pair of first fitting portions provided in the short side direction; a second fitting portion that fits onto the device at a position different from the first fitting portion; The bioelectric potential measuring device according to claim 3 .

5. The second fitting portion is fitted to the device in a different orientation from that of the first fitting portion. The bioelectric potential measuring device according to claim 4 .

6. The movable connecting member is integral with the device. The bioelectric potential measuring device according to claim 1 or 2.

7. the electrode sheet has a conductive portion connected to the contact portion, The conductive portion is a terminal portion that comes into contact with the contact portion; an electrode portion that comes into contact with the living body; a wiring portion connecting the terminal portion and the electrode portion, The bioelectric potential measuring device according to claim 1 or 2.

8. The surface of the terminal portion is harder than the wiring portion. The bioelectric potential measuring device according to claim 7 .

9. the device has a housing portion in which the connection member is housed, The contact portion to which the terminal portion is connected is disposed in the housing portion. The bioelectric potential measuring device according to claim 7 .

10. The fitting portion has a restricting portion that restricts deformation of the electrode sheet in a first direction. The bioelectric potential measuring device according to claim 1 or 2.

11. The connection member is integrated with the electrode sheet. The bioelectric potential measuring device according to claim 1 or 2.

12. The device has an attachment / detachment mechanism for attaching and detaching the connection member. The bioelectric potential measuring device according to claim 1 or 2.

13. The attachment / detachment mechanism includes: a moving member movable between a mating position where the moving member is mated with the mating portion and a non-mating position where the moving member is disengaged from the mating position; a biasing member that biases the moving member from the non-engaged position toward the engaged position, The bioelectric potential measuring device according to claim 12.