Mis-mating prevention connector

Abstract

To provide an erroneous fitting prevention connector capable of suppressing damage to a hood part and improving reliability of an erroneous fitting prevention function.SOLUTION: An erroneous fitting prevention connector comprises: a female connector housing 3 in which a guide projection 40 is provided on one side face in a projecting manner; and a male connector housing 6 in which a lower guide groove 67 recessed on an inner wall surface of a hood part 60 extends in a fitting direction. Only in a case where the female connector housing 3 and the male connector housing 6 are at regular insertion positions, connector fitting is allowed while the guide projection 40 is fitted into the lower guide groove 67. In a front end portion of a left sidewall 62, there is formed an interference part 71 to which a housing front-side end face 41 of the guide projection 40 is abutted in a case where the female connector housing 3 is wrong in the insertion position. The interference part 71 includes an abutted recess 73 and an inclined abutted face 75. The housing front-side end face 41 includes an abutment surface which is abutted to a bottom face 73a of the abutted recess 73, and an inclined abutment surface which is abutted with the inclined abutted surface 75.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mis-mating prevention connector. [Background technology]

[0002] Some connectors have a guide protrusion protruding from one housing and a guide groove recessed in the other housing in the mating direction to receive the guide protrusion, thereby preventing the connector from being erroneously mated in an insertion position different from the correct insertion position.

[0003] For example, in the connector erroneous insertion prevention structure disclosed in Patent Document 1, a recess is formed at the opening of the insertion hole (hood portion) of the female connector, which is engaged with a protrusion provided on the guide projection of the male connector in the insertion direction to prevent further insertion. Furthermore, at least one of the engagement portions of the protrusion and the recess is formed with an inwardly inclined surface that directs the opening side of the outer wall of the insertion hole of the female connector inward. Therefore, even if an attempt is made to forcibly insert the two connectors with a large pressing force, the protrusion and the recess are fitted and locked together, preventing the male connector from being inserted into the female connector. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-129311 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned connector mis-insertion prevention structure, if the two connectors are forcibly inserted with a large pressing force in the event of mis-mating, the pressing force in the mating direction is concentrated on the outer wall of the female connector insertion hole in which the recess is formed due to the contact between the protrusion and the recess. Furthermore, stress in the plate thickness direction is applied to the outer wall due to the inwardly inclined surface formed on the mating locking portion. As a result, excessive stress is applied to the connection portion between the outer wall in which the recess is formed and the adjacent outer wall, and there is a risk of the insertion hole (hood portion) being damaged.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide an anti-mis-mating connector that can suppress damage to the hood portion and improve the reliability of the mis-mating prevention function. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the mis-mating prevention connector of the present invention has the following features. a mating connector housing having a guide protrusion protruding from one side surface at the front of the housing, and a square tubular hood portion which fits onto an outer periphery of the connector housing, the mating connector housing having a guide groove recessed into an inner wall surface of one side wall of the hood portion and extending along the fitting direction, An erroneous mating prevention connector in which the guide protrusions are fitted into the guide grooves and connector mating is permitted only when the connector housing and the mating connector housing are in normal insertion positions, an interference portion is formed at a front end portion of the other side wall of the hood portion that is parallel to the one side wall, with which a housing front end surface of the guide projection abuts when the connector housing is in a misaligned insertion position relative to the hood portion by a half turn, The interference portion is formed continuously between a contact recess provided in a front end surface of the other side wall, a bottom surface of the contact recess, and the front end surface of the other side wall. Extending in a direction parallel to the plate thickness direction and with respect to the bottom surface and the front end surface and a tilted abutment surface, The housing front end surface has an abutment surface that abuts against a bottom surface of the abutment recess, and an inclined abutment surface that is formed continuously with the abutment surface and abuts against the inclined abutment surface. Mis-mating prevention connector. Effect of the Invention

[0008] According to the mis-mating prevention connector of the present invention, damage to the hood portion can be suppressed, and the reliability of the mis-mating prevention function can be improved.

[0009] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following description of the embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an exploded perspective view of an erroneous mating prevention connector according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the connector shown in FIG. [Diagram 3] FIG. 3 is a perspective view of the connector shown in FIG. 2 as viewed from above and on the front side. [Figure 4] FIG. 4 is a perspective view of the connector shown in FIG. 2 as viewed from the lower front side. [Diagram 5] FIG. 5 is a perspective view of the mating connector shown in FIG. 1 as viewed from the lower front side. [Figure 6] FIG. 6 is a front view of the mating connector shown in FIG. 1 as viewed from the front. [Figure 7] FIG. 7 is a vertical cross-sectional view showing a state in which the mis-mating prevention connector shown in FIG. 1 is properly mated. [Figure 8] FIG. 8 is a perspective view showing the mis-mating prevention connector in a state where the connector is rotated half a turn relative to the mating connector and is in a wrong insertion position. [Figure 9] FIG. 9 is a front view of the erroneous mating prevention connector shown in FIG. 8 as viewed from the front of the mating connector. [Figure 10]FIG. 10 is a cross-sectional view taken along the line XX in FIG. [Figure 11] FIG. 11 is an enlarged view of a main portion of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Specific embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a mis-mating prevention connector 1 according to one embodiment of the present invention.

[0012] The mis-mating prevention connector 1 according to this embodiment comprises a connector 2 and a mating connector 4 that mates with the connector 2. In this embodiment, the connector 2 is a female connector having a female connector housing 3 (connector housing) that accommodates female terminals 57. The mating connector 4 is a male connector having a male connector housing 6 (mating connector housing) that accommodates male terminals 80. Note that the gender of the connectors is not limited to this.

[0013] In this specification, the front-rear direction, up-down direction, and left-right direction of the connector 2 correspond to the directions of the arrows shown in Fig. 3. That is, the front-rear direction of the connector 2 is the direction along the connector fitting direction, and the side into which the mating connector 4 is fitted is the front of the connector 2. In addition, the front-rear direction, up-down direction, and left-right direction of the mating connector 4 correspond to the directions of the arrows shown in Fig. 5. That is, the front-rear direction of the mating connector 4 is the direction along the connector fitting direction, and the side into which the connector 2 is fitted is the front of the mating connector 4.

[0014] Fig. 2 is an exploded perspective view of the connector 2 shown in Fig. 1. Figs. 3 and 4 are perspective views of the connector 2 shown in Fig. 2 as viewed from the front upper side and the front lower side. 2 to 4, the connector 2 is composed of a female connector housing 3 serving as a connector housing, a side spacer 5, and a pair of female terminals 57. The female connector housing 3 is molded from an electrically insulating synthetic resin. The side spacer 5 is made of an electrically insulating synthetic resin.

[0015] The female connector housing 3 is formed in a rectangular tubular shape having a bottom wall 31, left and right side walls 32, 33, and an upper wall 34, and is formed with a pair of terminal accommodating chambers 35 that penetrate in the front-rear direction. The bottom wall 31 of the female connector housing 3 is formed with elastic locking pieces 39 (flexible lances) that protrude into the terminal accommodating chambers 35.

[0016] Further, a spacer insertion hole 51 is formed in the bottom wall 31 of the female connector housing 3, traversing a part of the terminal accommodating chamber 35 in a direction intersecting the terminal insertion direction (connector fitting direction) (left-right direction). A side spacer 5 is assembled in the spacer insertion hole 51 in a provisionally locked state, as shown in Figs. 3 and 4.

[0017] The female terminal 57 is formed in a rectangular tube shape and made of a conductive metal. The female terminal 57 is electrically connected to an end of the coated electric wire 55. The female terminals 57 inserted into the terminal accommodating chambers 35 of the female connector housing 3 are retained in the terminal accommodating chambers 35 by being locked by the elastic locking pieces 39. Furthermore, the side spacers 5 assembled to the female connector housing 3 are brought into a fully locked state, so that the female terminals 57 are doubly locked by the side spacers 5.

[0018] An elastically deformable lock arm 36 having a lock protrusion 37 and an operating protrusion 38 is formed on an upper wall 34 of the female connector housing 3. A guide projection 40 and a guide rib 49 are provided on the left side wall 32 which is one side surface of the female connector housing 3 .

[0019] 3 and 4, the guide projection 40 is a generally rectangular parallelepiped projection that protrudes from the left side wall 32 at the front of the housing and extends in the front-rear direction (connector fitting direction). A housing front end face 41 of the guide projection 40 has an abutment surface 43 and an inclined abutment surface 45 formed continuous with the abutment surface 43. Furthermore, the guide projection 40 of this embodiment has a front end face abutment surface 47 formed continuous with the inclined abutment surface 45. The guide rib 49 is a protrusion that protrudes from the left wall 32 above the housing and extends in the front-rear direction.

[0020] An inclined surface 48 that is continuous with the front end surface 44 is formed on the outer circumferential edge of the front end surface 44 of the female connector housing 3. This inclined surface 48 is a guide surface that slides against an inclined surface 68 of a hood portion 60 (described later) to guide the connector 2 into the mating space when the connector 2 and the mating connector 4 are mated.

[0021] 5 and 6 are a perspective view of the mating connector 4 shown in FIG. 1 as viewed from the front lower side and a front view as viewed from the front. 5 and 6, the mating connector 4 is composed of a male connector housing 6 as a mating connector housing, and male terminals 80. The male connector housing 6 is molded from an electrically insulating synthetic resin.

[0022] The male connector housing 6 is formed into a rectangular, bottomed cylindrical shape having a bottom wall 61, left and right side walls 62, 63, a top wall 64, and a rear wall 65. The bottom wall 61, the left and right side walls 62, 63, and the top wall 64 form a square cylindrical hood portion 60 that fits onto the outer periphery of the female connector housing 3. In other words, the hood portion 60 forms a substantially rectangular parallelepiped fitting space into which the female connector housing 3 is fitted.

[0023] An inclined surface 68 continuous with the front end surface 66 is formed on the inner peripheral edge of the front end surface 66 of the hood portion 60 on the mating space side. This inclined surface 68 is a guide surface that slides against the inclined surface 48 of the female connector housing 3 to guide the connector 2 into the mating space when the connector 2 and the mating connector 4 are mated.

[0024] A pair of male terminals 80 are vertically disposed on the inner wall 65 of the male connector housing 6 so as to protrude into the mating space. The male terminals 80 are formed into a pin shape from a conductive metal. When the connector 2 and the mating connector 4 are mated, the male terminals 80 are electrically connected to the female terminals 57 accommodated in the terminal accommodating chambers 35 of the female connector housing 3. The upper wall 64 of the male connector housing 6 is formed with a locked portion 70 with which the lock arm 36 of the female connector housing 3 engages.

[0025] A lower guide groove 67 (guide groove) and an upper guide groove 69 are recessed in the inner wall surface of the right side wall 63, which is one of the side walls of the hood portion 60 of the male connector housing 6, extending along the fitting direction. The lower guide groove 67 has a cross-sectional shape corresponding to the guide protrusion 40 of the female connector housing 3. The upper guide groove 69 has a cross-sectional shape corresponding to the guide rib 49 of the female connector housing 3.

[0026] In other words, these lower guide grooves 67 and upper guide grooves 69 allow the connectors to be mated while engaging with the guide protrusions 40 and guide ribs 49 only when the female connector housing 3 is in the correct insertion position relative to the male connector housing 6.

[0027] An interference portion 71 is formed at the front end portion of the left side wall 62, which is the other side wall parallel to the right side wall 63 (one side wall) of the hood portion 60. When the female connector housing 3 is misaligned with respect to the hood portion 60 by rotating half a turn about the fitting direction, the housing front end surface 41 of the guide projection 40 abuts against the interference portion 71.

[0028] The interference portion 71 has an abutment recess 73 recessed into the front end face 66 of the left side wall 62, and an inclined abutment surface 75 formed continuously between the bottom surface 73a of the abutment recess 73 and the front end face 66 of the left side wall 62, and inclined along a direction parallel to the opening edge 62a of the left side wall 62. That is, the housing front end face 41 of the guide projection 40 has the abutment surface 43 abutting against the bottom surface 73a of the abutted recess 73, and the inclined abutment surface 45 abutting against the inclined abutted surface 75. Furthermore, the front end face abutment surface 47 of the guide projection 40 also abuts against the front end face 66 of the left side wall 62.

[0029] Furthermore, the front end surface 49a of the guide rib 49 abuts against the front end surface 66 of the left side wall 62 when the female connector housing 3 is in a misaligned insertion position, rotated half a turn about the fitting direction relative to the hood portion 60.

[0030] Next, the case where the erroneous mating prevention connector 1 is mated will be described. Fig. 7 is a vertical cross-sectional view showing the mis-mating prevention connector 1 shown in Fig. 1 in a properly mated state. Fig. 8 is a perspective view showing the mis-mating prevention connector 1 in a state in which the connector 2 is rotated half a turn relative to the mating connector 4 and is in a misaligned insertion position. Fig. 9 is a front view of the mis-mating prevention connector 1 shown in Fig. 8 as seen from the front of the mating connector 4. Fig. 10 is a cross-sectional view taken along the line XX in Fig. 9. Fig. 11 is an enlarged view of the main parts of Fig. 10.

[0031] When mating the mis-mating prevention connector 1, in order to mate the connector 2 with the mating connector 4, the front end of the female connector housing 3 of the connector 2 is brought close to the front end of the male connector housing 6 of the mating connector 4. Then, the female connector housing 3 is inserted into the hood portion 60 while the inclined surface 48 of the female connector housing 3 is brought into sliding contact with the inclined surface 68 of the hood portion 60 of the male connector housing 6.

[0032] 7, when the mating connector 4 and the connector 2 are properly mated, the locking protrusion 37 of the locking arm 36 is engaged with the locked portion 70 of the male connector housing 6. This causes the mating connector 4 and the connector 2 to be locked in the mated state. In the mated state, the female terminal 57 connected to the end of the coated electric wire 55 and accommodated in the terminal accommodating chamber 35 of the female connector housing 3 is electrically connected to the male terminal 80 accommodated in the male connector housing 6 .

[0033] On the other hand, when the female connector housing 3 is in the wrong insertion position, upside down, relative to the hood portion 60 of the male connector housing 6, as shown in Figures 8 to 10, when the female connector housing 3 is inserted into the hood portion 60 while the inclined surface 48 of the female connector housing 3 is brought into sliding contact with the inclined surface 68 of the hood portion 60, the housing front side end surface 41 of the guide protrusion 40 of the female connector housing 3 abuts against the interference portion 71 of the hood portion 60. At the same time, the front end surface abutment surface 47 of the guide protrusion 40 abuts against the front end surface 66 of the left side wall 62. Furthermore, the front end surface 49a of the guide rib 49 of the female connector housing 3 abuts against the front end surface 66 of the hood portion 60.

[0034] Therefore, the female connector housing 3 cannot be fitted any further into the hood portion 60 of the male connector housing 6. At this time, as shown in Figure 11, a pressing force F attempting to forcibly insert the female connector housing 3 is applied to the left side wall 62 of the hood portion 60 of the male connector housing 6. At that time, the abutment surface 43 of the guide protrusion 40 abuts against the bottom surface 73a of the abutted recess 73 of the left side wall 62 of the hood portion 60, so that a pressing force F1 in the fitting direction is applied to the left side wall 62. At the same time, the inclined abutment surface 45 of the guide protrusion 40 abuts against the inclined abutted surface 75 of the left side wall 62 of the hood portion 60, so that distributed pressing forces f2a and f2b, which are distributed in a direction intersecting the fitting direction from the pressing force F2 in the fitting direction, are applied to the left side wall 62.

[0035] As a result, in the mis-mating prevention connector 1 of this embodiment, the pressing force F applied from the housing front end face 41 of the guide protrusion 40 to the left side wall 62 is not only the pressing force F1 in the mating direction, but also distributed pressing forces f2a and f2b in the non-mating direction applied to the left side wall 62. Furthermore, the distributed pressing forces f2a and f2b caused by the inclined abutting surface 45 of the guide protrusion 40 abutting against the inclined abutted surface 75 that is inclined along a direction parallel to the opening edge 62a of the left side wall 62 do not apply stress in the plate thickness direction of the left side wall 62.

[0036] As a result, the left side wall 62 is pushed outward, and excessive stress is not applied to the connecting portions between the left side wall 62 and the adjacent top wall 64 and bottom wall 31, thereby preventing cracks from occurring from the front end side of the connecting portion of the hood portion 60 and preventing damage to the hood portion 60 itself.

[0037] Furthermore, in the mis-mating prevention connector 1 of this embodiment, the front end face abutment surface 47 of the guide projection 40 abuts against the front end face 66 of the left side wall 62 of the hood portion 60, so that a pressing force F3 in the mating direction is applied to the left side wall 62. Therefore, the pressing force F is distributed into the pressing force F1, the distributed pressing force f2a and the distributed pressing force f2b, and the pressing force F3 and is applied to the left side wall 62 without being concentrated, so that damage to the hood portion 60 can be further suppressed.

[0038] Therefore, according to the mis-mating prevention connector 1 of this embodiment, damage to the hood portion 60 can be suppressed, and the reliability of the mis-mating prevention function can be improved.

[0039] The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

[0040] Here, the features of the embodiments of the mis-mating prevention connector according to the present invention described above will be briefly summarized and listed below. [1] A connector housing (female connector housing 3) having a guide projection (40) protruding from one side surface at the front of the housing, and a mating connector housing (male connector housing 6) having a square cylindrical hood portion (60) that fits onto the outer periphery of the connector housing (female connector housing 3), and a guide groove (lower guide groove 67) recessed into the inner wall surface of one side wall (right side wall 63) of the hood portion (60) extending along the fitting direction, An erroneous mating prevention connector (1) in which the guide protrusion (40) is fitted into the guide groove (lower guide groove 67) and connector mating is permitted only when the connector housing (female connector housing 3) and the mating connector housing (male connector housing 6) are in the correct insertion position, An interference portion (71) is formed at a front end portion of the other side wall (left side wall 62) of the hood portion (60) that is parallel to the one side wall (right side wall 63) of the hood portion (60), against which the housing front end surface (41) of the guide projection (40) abuts when the connector housing (female connector housing 3) is in a misaligned insertion position relative to the hood portion (60) by a half turn, The interference portion (71) has an abutment recess (73) recessed into a front end surface (66) of the other side wall (left side wall 62), and an inclined abutment surface (75) formed continuously between a bottom surface (73a) of the abutment recess (73) and the front end surface (66) of the other side wall (left side wall 62) and inclined along a direction parallel to an opening edge (62a) of the other side wall (left side wall 62), The housing front end surface (41) has a contact surface (43) that contacts the bottom surface (73a) of the contact recess (73), and an inclined contact surface (45) that is formed continuously with the contact surface (43) and contacts the inclined contact surface (75). Anti-mis-mating connector (1).

[0041] According to the mis-mating prevention connector (1) having the configuration [1] above, when the connector housing (female connector housing 3) is in the wrong insertion position, upside down, relative to the hood portion (60) of the mating connector housing (male connector housing 6), when the connector housing (female connector housing 3) is inserted into the hood portion (60), the housing front end face (41) of the guide projection (40) in the connector housing (female connector housing 3) abuts against the interference portion (71) of the hood portion (60). At the same time, the front end face abutment surface (47) of the guide projection (40) abuts against the front end face 66 of the other side wall (left side wall 62). Therefore, the connector housing (female connector housing 3) cannot be fitted any further into the hood portion (60) of the mating connector housing (male connector housing 6). At this time, the pressing force (F) applied to forcibly insert the connector housing (female connector housing 3) is applied to the other side wall (left side wall 62) of the hood portion (60) of the mating connector housing (male connector housing 6). At that time, the abutment surface (43) of the guide protrusion (40) abuts against the bottom surface (73a) of the abutted recess (73) of the other side wall (left side wall 62) of the hood portion (60), so that a pressing force (F1) in the fitting direction is applied to the other side wall (left side wall 62). At the same time, the inclined abutment surface (45) of the guide protrusion (40) abuts against the inclined abutted surface (75) of the other side wall (left side wall 62) of the hood portion (60), so that distributed pressing forces (f2a) and (f2b) that are distributed in a direction intersecting the fitting direction from the pressing force (F2) in the fitting direction are applied to the other side wall (left side wall 62). As a result, in the mis-mating prevention connector (1) having the configuration [1] above, the pressing force (F) applied from the housing front end face (41) of the guide projection (40) to the other side wall (left side wall 62) is not only the pressing force (F1) in the mating direction, but also distributed pressing forces (f2a) and (f2b) in the non-mating direction that are applied to the other side wall (left side wall 62). Furthermore, the distributed pressing forces (f2a) and (f2b) caused by the inclined abutting surface (45) of the guide projection (40) abutting against the inclined abutted surface (75) that is inclined along a direction parallel to the opening edge (62a) of the other side wall (left side wall 62) do not apply stress in the plate thickness direction of the other side wall (left side wall 62). As a result, the other side wall (left side wall 62) is pushed outward, and excessive stress is not applied to the connecting portion between the other side wall (left side wall 62) and the adjacent side wall (top wall 64 and bottom wall 31), which prevents cracks from occurring from the front end side of the connecting portion of the hood portion (60) and prevents damage to the hood portion (60) itself.

[0042] [2] The housing front end surface (41) has a front end surface abutment surface (47) that is formed continuously with the inclined abutment surface (45) and abuts against a front end surface (66) of the other side wall (left side wall 62). The mis-mating prevention connector (1) described above in (1).

[0043] According to the mis-mating prevention connector (1) having the configuration [2] above, the front end face abutment surface (47) of the guide projection (40) abuts against the front end face (66) of the other side wall (left side wall 62) of the hood portion (60), so that a pressing force (F3) in the mating direction is applied to the other side wall (left side wall 62). Therefore, the pressing force (F) is distributed into the pressing force (F1), the distributed pressing force (f2a), the distributed pressing force (f2b), and the pressing force (F3), and is applied to the other side wall (left side wall 62) without being concentrated, so that damage to the hood portion (60) can be further suppressed. [Explanation of symbols]

[0044] 1. Mis-mating prevention connector 3...Female connector housing (connector housing) 6...Male connector housing (mating connector housing) 40...Guide protrusion 41…Front end face of housing 43…Abutment surface 45…Slanted contact surface 47…Front end surface contact surface 60…Hood section 62...Left wall (other side wall) 62a…Opening edge 63…Right side wall (one side wall) 66…Front end surface 67...Lower guide groove (guide groove) 71...Interference part 73…being used as a concave part 73a… bottom 75… Leaning is regarded as a face

Claims

1. a mating connector housing having a guide protrusion protruding from one side surface at the front of the housing, and a square tubular hood portion which fits onto an outer periphery of the connector housing, the mating connector housing having a guide groove recessed into an inner wall surface of one side wall of the hood portion and extending along the fitting direction, An erroneous mating prevention connector in which the guide protrusions are fitted into the guide grooves and connector mating is permitted only when the connector housing and the mating connector housing are in normal insertion positions, an interference portion is formed at a front end portion of the other side wall of the hood portion that is parallel to the one side wall, with which a housing front end surface of the guide projection abuts when the connector housing is in a misaligned insertion position relative to the hood portion by a half turn, the interference portion has an abutted recess formed in a front end surface of the other side wall, and an inclined abutted surface formed continuously between a bottom surface of the abutted recess and the front end surface of the other side wall, extending in a direction parallel to a plate thickness direction of the other side wall and inclined with respect to the bottom surface and the front end surface, The housing front end surface has an abutment surface that abuts against a bottom surface of the abutment recess, and an inclined abutment surface that is formed continuously with the abutment surface and abuts against the inclined abutment surface. Mis-mating prevention connector.

2. A connector housing having a guide protrusion protruding from one side surface at the front of the housing, and a mating connector housing having a square cylindrical hood portion which fits onto the outer periphery of the connector housing, with a guide groove recessed into the inner wall surface of one side wall of the hood portion and extending along the fitting direction; An erroneous mating prevention connector in which the guide protrusions are fitted into the guide grooves and connector mating is permitted only when the connector housing and the mating connector housing are in normal insertion positions, an interference portion is formed at a front end portion of the other side wall of the hood portion that is parallel to the one side wall, with which a housing front end surface of the guide projection abuts when the connector housing is in a misaligned insertion position relative to the hood portion by a half turn, the interference portion has an abutment recess formed in a front end surface of the other side wall, and an inclined abutment surface formed continuously between a bottom surface of the abutment recess and the front end surface of the other side wall and inclined along a direction parallel to an opening edge of the other side wall, the housing front end surface has a contact surface that contacts a bottom surface of the contact recess, and an inclined contact surface that is formed continuously with the contact surface and contacts the inclined contacted surface, the housing front end surface has a front end surface abutment surface that is formed continuously with the inclined abutment surface and abuts against the front end surface of the other side wall, Mis-mating prevention connector.

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