Golf club head fitting device, fitting method, and fitting program

Abstract

Provided are a golf club head fitting device, etc., capable of easily specifying a golf club head suitable for each swing motion of a player.　A golf club head fitting device 200 includes an acquisition unit 201 that acquires measurement data obtained by measuring a swing motion of a golf club by a player through use of a measurement instrument, a calculation unit 202 that calculates a swing index on the basis of measurement data, and a selection unit 203 that selects at least one golf club head suitable for the player from among a plurality of candidate golf club heads on the basis of the swing index.

Description

Golf club head fitting device, fitting method, and fitting program

[0001] The present invention relates to a golf club head fitting device, a fitting method, and a fitting program.

[0002] In recent years, various fitting devices have been proposed for measuring a player's swing motion and proposing a golf club shaft suited to the player's swing motion (see Patent Documents 1 and 2 listed below).

[0003] Patent Document 1: JP 2023-103070 A Patent Document 2: Japanese Patent No. 6087132 A

[0004] Golf club manufacturers sell a variety of golf club heads with different specifications to suit players of different physiques and skill levels. Here, the specifications of a golf club head include, for example, head volume, moment of inertia, center of gravity position, etc.

[0005] However, since each player's swing motion is different, it is not easy to identify a golf club head that is suitable for each swing motion.

[0006] The present invention was devised in consideration of the above-mentioned problems, and its main objective is to provide a golf club head fitting device, fitting method, and fitting program that can easily identify a golf club head that is suitable for each player's swing motion.

[0007] The present invention is a golf club head fitting device that includes an acquisition unit that acquires measurement data obtained by measuring a player's golf club swing motion using a measuring device, a calculation unit that calculates a swing index based on the measurement data, and a selection unit that selects at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index.

[0008] By adopting the above-described configuration, the golf club head fitting device of the present invention makes it possible to easily identify a golf club head that is suited to the swing motion of each player.

[0009] FIG. 1 is an overall configuration diagram showing a golf club head fitting system of this embodiment. FIG. 2 is a block diagram of the fitting system of this embodiment. FIG. 3 is a diagram explaining a swing motion. FIG. 4 is a graph showing the relationship between time during a swing motion and angular velocity in the cocking direction. FIG. 5 is a graph showing the relationship between time during a swing motion and angular velocity around the shaft axis. FIG. 6 is a front view of a golf club head placed in a reference state for explaining center-of-gravity distance LB. FIG. 7 is a side view of a golf club head placed in a reference state for explaining center-of-gravity distance LC, viewed from the toe side. FIG. 8 is a flowchart showing an example of a procedure for creating a stratified data section. FIG. 9 is a graph showing the relationship between a first index, a second index, and candidate golf club heads as an example of the stratified data section. FIG. 10 shows, as an example, the results of a player using a golf club head selected by the fitting device, showing the flight distance, lateral deviation, and height of the ball. FIG. 11 shows, as a comparative example, the results of a player using a golf club head other than the golf club head selected by the fitting device, showing the flight distance, lateral deviation, and height of the ball.

[0010] An embodiment of the present invention will be described below with reference to the drawings. The specific configurations shown in the following embodiments and drawings are intended to aid in understanding the contents of the present invention, and the present invention is not limited to the specific configurations shown. Furthermore, in multiple embodiments, the same or common elements are designated by the same reference numerals throughout the specification, and redundant explanations will be omitted.

[0011] FIG. 1 shows an overall configuration diagram of a fitting system 1 including a golf club head fitting device 200 of this embodiment. FIG. 2 shows a block configuration diagram of the fitting system 1 of this embodiment. In this embodiment, the fitting of a golf club head begins by measuring the swing motion of a player 3 who wishes to be fitted with a golf club head. Next, a swing index is calculated from the swing motion. Then, at least one golf club head suitable for the player 3 is selected from a plurality of candidate golf club heads based on this swing index. Therefore, the fitting system 1 of the present invention makes it possible to easily identify a golf club head suitable for the individual swing motion of the player.

[0012] As shown in Figures 1 and 2, the fitting system 1 of this embodiment includes, for example, a swing sensor 100 that can be attached to a golf club 2 as measuring equipment for measuring the swing motion of the golf club 2, a fitting device 200, and a display unit 300.

[0013] [Golf Club] The golf club 2 has, for example, a grip 21, a shaft 22, and a golf club head 23. In this embodiment, a wood-type golf club is shown as the golf club 2. In other embodiments, the golf club 2 may be an iron-type club, a hybrid club having a shape intermediate between the wood-type and iron-type clubs, or the like.

[0014] The golf club 2 in FIG. 1 is a test golf club for measuring a swing motion. There are no particular restrictions on the specifications of the test golf club, but it is desirable that the test golf club have a shaft 22 (weight, hardness, torque, kick point, etc.) that is suitable for the swing motion of the player 3. For example, prior to the actual measurement, a shaft that is suitable for the swing motion of the player 3 is determined in advance using a fitting device such as that described in Patent Document 1 or 2 above. Then, it is desirable that the test golf club be prepared so as to have the determined shaft. This allows the original swing motion of the player 3 to be measured more accurately.

[0015] [Swing Sensor] In this embodiment, the swing motion is measured by the above-described swing sensor 100. The swing sensor 100 is configured to be attachable to the golf club 2, for example, as shown in FIG. 1 . The swing sensor 100 of this embodiment is detachable from the grip 21 or shaft 22 of the golf club 2. It is desirable that the swing sensor 100 be configured to be small and lightweight so as not to interfere with the swing motion of the player 3.

[0016] The swing sensor 100 of this embodiment can measure a predetermined physical quantity from the golf club 2 during a swing motion. The swing sensor 100 of this embodiment includes an angular velocity measurement unit 101 ( FIG. 2 ) and can measure the angular velocity of the golf club 2 during a swing motion. As shown in FIG. 1 , the swing sensor 100 of this embodiment can measure angular velocities ωx, ωy, and ωz about each axis of a local coordinate system x, y, and z, which has its origin at the attachment position to the golf club 2, at a predetermined sampling period (e.g., 1 millisecond). Here, the x-axis is the toe-heel direction of the golf club head 23, the y-axis is the direction of the target flight line of the hit ball (the normal direction to the face of the golf club head 23), and the z-axis is the axial direction of the shaft 22.

[0017] Therefore, when a player 3 wishing to be fitted swings the test golf club 2 equipped with the swing sensor 100 to hit the ball 4 one or more times, the measurement data (the angular velocities ωx, ωy, and ωz) can be measured by the swing sensor 100.

[0018] As shown in FIG. 2 , the swing sensor 100 of this embodiment further includes a communication unit 102 for providing the measured measurement data to the fitting device 200. The communication unit 102 is preferably wireless so as not to interfere with the swing motion. In another aspect, the communication unit 102 may be wired. Furthermore, the swing sensor 100 may include a removable storage medium (not shown) instead of or in addition to the communication unit 102. In this case, the measurement data may be temporarily stored in the storage medium and then imported into the fitting device 200 via this storage medium.

[0019] [Fitting Device] The fitting device 200 of this embodiment acquires measurement data from the swing sensor 100 and executes predetermined processing. The fitting device 200 may be realized, for example, as various general-purpose computers, tablet computers, smartphones, or even dedicated terminals.

[0020] 2, fitting device 200 includes an acquisition unit 201 that acquires measurement data from swing sensor 100, a calculation unit 202 that calculates a swing index based on the measurement data, and a selection unit 203 that selects at least one golf club head suitable for player 3 from a plurality of candidate golf club heads based on the swing index. Fitting device 200 of this embodiment also includes a stratified data unit 204 in which swing indexes are stratified and a plurality of candidate golf club heads with different specifications are associated with each stratification.

[0021] The fitting device 200 of this embodiment further includes an input unit 205, a storage unit 206, and a control unit 207. The input unit 205 is composed of, for example, a keyboard, a mouse, a virtual keyboard on a tablet, etc. The storage unit 206 includes a non-volatile storage unit such as a hard disk that stores the fitting program and various master data, etc., and a volatile storage unit that serves as working memory. The control unit 207 operates each of the above units in accordance with the program, and is composed of, for example, a central processor (CPU).

[0022] [Acquisition Unit] The acquisition unit 201 of the fitting device 200 is configured to be able to communicate with the communication unit 102 of the swing sensor 100, for example, wirelessly. Therefore, the measurement data measured by the swing sensor 100 is acquired by the acquisition unit 201 via the communication unit 102. The measurement data acquired by the acquisition unit 201 is stored in the memory unit 206.

[0023] [Calculation Unit] The calculation unit 202 calculates a swing index based on the measurement data acquired by the acquisition unit 201. The swing index is a feature that quantitatively characterizes a certain swing motion. As long as the swing index is such a feature, various feature amounts can be adopted without any particular limitation. In this embodiment, for example, a first index that is an index related to the cocking motion of the swing motion and / or a second index that is an index related to the rotation of the swing motion around the shaft axis is adopted as the swing index.

[0024] [First Index (Index Related to Cocking)] FIG. 3 shows a portion of the player's hands and the shaft 22 during a swing from the top to impact. A player's swing generally involves the steps of address, backswing, top, downswing, and impact. The address refers to the stationary state immediately before the player 3 starts swinging (see FIG. 1 ). The backswing is the movement of lifting the golf club 2 from the address. The subsequent movement of swinging the golf club 2 down is called the downswing. The timing of switching from the backswing to the downswing is the top. In this series of swing movements, the cocking is the movement of bending the player's wrist and elbow joints. The cocking is one of the important movements for imparting speed and power to the golf club head 23 and hitting the ball farther. This embodiment focuses on the cocking as a first index for quantitatively identifying a swing. The cocking is primarily detected by the swing sensor 100 as a rotational movement of the golf club 2 around the y-axis in the local coordinate system.

[0025] FIG. 4 shows, as measurement data, the relationship between the angular velocity in the cocking direction (i.e., the angular velocity ωy around the y-axis) and time during a player's swing. Time 0 indicates the moment of impact with the ball. In this embodiment, the first index is obtained as a value obtained by integrating the angular velocity ωy in the cocking direction over a certain range. The first index in this embodiment is obtained, for example, as an integral value from the top position (top) of the swing to the open cocked state, i.e., the maximum position P1 of the angular velocity ωy (the hatched portion in FIG. 4). This integral range can be changed as desired. The first index makes it possible to identify the angular change in the cocking direction during the player's swing.

[0026] [Second Index (Index Related to Rotation)] The second index is an index related to the rotation around the shaft axis of the swing motion. Generally, the rotation around the shaft axis in the swing motion is called rotation. Rotation is a motion that mainly accompanies the rotational motion of the player's body, and serves to impart speed and power to the golf club head 23 and improve the accuracy of the shot. This embodiment focuses on this rotation as a second index for quantitatively identifying the swing motion. Rotation is detected by the swing sensor 100 mainly as the rotational motion of the golf club 2 around the z-axis in the local coordinate system.

[0027] FIG. 5 shows, as measurement data, the relationship between the angular velocity around the shaft axis (i.e., the angular velocity ωz around the z-axis) and time during a player's swing. Time 0 indicates the moment of impact with the ball. In this embodiment, the second index is obtained as a value obtained by integrating the angular velocity ωz around the shaft axis over time within a certain range. The second index in this embodiment is, for example, the integral value over the range from the top position (top) of the swing to impact (the hatched portion in FIG. 5). This integral range can be changed as desired. The second index makes it possible to identify changes in the angle of rotation during the player's swing.

[0028] [Selection Unit] The selection unit 203 of the fitting device 200 can select at least one golf club head suitable for the player 3 from among a plurality of candidate golf club heads based on the above-mentioned swing indicators (first indicator and / or second indicator).

[0029] The plurality of candidate golf club heads is a group of pre-specified golf club heads that differ from each other in at least one specification. The plurality of candidate golf club heads preferably includes three or more types of golf club heads. In this specification, the specifications of the golf club head include, for example, head volume, moment of inertia, and center of gravity position. The moment of inertia of the golf club head includes, for example, at least one of the moment of inertia about a vertical axis passing through the center of gravity of the head in a reference state in which the golf club head is placed on a horizontal plane with a specified lie angle and loft angle (hereinafter referred to as "lateral MOI"), the moment of inertia about a horizontal axis passing through the center of gravity in the toe-heel direction (hereinafter referred to as "vertical MOI"), and the moment of inertia about the shaft axis (hereinafter referred to as "axial MOI"). The center of gravity position of the golf club head includes, for example, the distance in the toe-heel direction of a line drawn perpendicularly from the head center of gravity G to the shaft axis CL in a front view of the golf club head 23 placed in a standard state on a horizontal plane HP (hereinafter referred to as the center of gravity distance LB), as shown in FIG. 6, and the distance in the face-back direction from the shaft axis CL to the head center of gravity G in a side view of the golf club head 23 placed in a standard state on a horizontal plane HP (hereinafter referred to as the center of gravity distance LC), as shown in FIG.

[0030] [Stratification Data Section] In the fitting device 200 of this embodiment, the selection section 203 selects at least one golf club head suitable for player 3 based on the swing index of player 3 and the stratification data section 204. The stratification data section 204 is statistical data in which the swing indexes are stratified based on swing indexes measured in advance for a plurality of players and evaluation results of hit balls in hitting tests, and at least one of a plurality of candidate golf club heads suitable for each stratification is assigned. Therefore, the selection section 203 can easily identify a golf club head suitable for the swing index by applying the swing index of the player to be fitted to the stratification data section 204.

[0031] The stratified data section 204 can be created, for example, by the procedure shown in Fig. 8. That is, in this embodiment, the stratified data section 204 is created by including the steps of: step S1 of measuring swing movements of a plurality of players; step S2 of calculating swing indices (first and second indices) from the swing movements of the plurality of players; step S3 of conducting hitting tests using a plurality of candidate golf club heads by the plurality of players; step S4 of evaluating the quality of hit balls in the hitting tests (for example, the quality of flight distance, height, and / or lateral deviation); step S5 of determining candidate golf club heads suitable for each of the plurality of players based on the results of the evaluation; and step S6 of stratifying the swing indices and allocating at least one candidate golf club head suitable for each stratification based on the results of step S5.

[0032] In step S5, an optimum candidate golf club head is determined for each player as shown in Table 1. In this example, any one of the three candidate golf club heads A to C is determined as the optimum candidate golf club head.

[0033]

[0034] Fig. 9 is a graph visualizing the relationship between the first index, the second index, and the candidate golf club heads as an example of the stratified data section 204. In Fig. 9, the horizontal axis is set to the value of the first index of the swing motion, and the vertical axis is set to the value of the second index of the swing motion. Fig. 9 also plots the swing motions identified by the first index and the second index of 29 representative players. There are three types of identification marks for the plots, each of which has the following meaning. White circle: Swing motion for which candidate golf club head A was most suitable Black circle: Swing motion for which candidate golf club head B was most suitable Square: Swing motion for which candidate golf club head C was most suitable

[0035] In this embodiment, the specifications of candidate golf club heads A to C are as shown in the table below.

[0036]

[0037] Specification characteristics of golf club head A: Golf club head A has a relatively large head volume among the candidate golf club heads. Also, golf club head A has a relatively large moment of inertia (lateral MOI, vertical MOI, and axial MOI) among the candidate golf club heads, with the lateral MOI being 5000 g cm 2 Furthermore, golf club head A has the longest center of gravity distance LC among the candidate golf club heads. This golf club head A provides a sense of security when addressing the club, and has high "forgiveness" because head movement (left and right deviation) is limited on mishits.

[0038] Characteristics of golf club head B: Among the candidate golf club heads, golf club head B has a relatively small head volume. Also, the moment of inertia (left-right MOI, up-down MOI, and axial MOI) of golf club head B is located between golf club head A and golf club head C. Furthermore, golf club head B has the smallest center of gravity distance LB among the candidate golf club heads. Therefore, golf club head B has excellent operability, such as making it easy to adjust the orientation of the golf club head around the shaft axis during a swing motion.

[0039] Characteristics of golf club head C: Golf club head C also has a relatively large head volume among the candidate golf club heads. Furthermore, golf club head C has the smallest moment of inertia (left-right MOI, up-down MOI, and axial MOI) among the candidate golf club heads. Furthermore, golf club head C has the smallest center of gravity distance LC among the candidate golf club heads. Such golf club head C has a low center of gravity height on the face (also called sweet spot height), which tends to reduce the amount of backspin on the ball. Furthermore, since the axial MOI is small, it has good maneuverability.

[0040] In Fig. 9, the swing index is further stratified into six levels, L1 to L6, based on the plotted data. One or two of the candidate golf club heads A to C are assigned to each of the levels L1 to L6. In the example of Fig. 9, the following recommended golf club heads are assigned from the candidate golf clubs to each of the levels L1 to L6. Level L1: Golf club head B Level L2: Golf club heads B and C Level L3: Golf club head C Level L4: Golf club heads A and B Level L5: Golf club heads A and C Level L6: Golf club head A

[0041] Layer L1 is a group of swing motions in which both the first index and the second index are relatively large. In other words, swing motions belonging to layer L1 have large cocking motions and rotations, and therefore relatively large opening and closing motions of the face from the top to impact. In the embodiment of Figure 9, golf club head B is assigned as optimal for swing motions in layer L1 based on impact tests. As described above, golf club head B has a small moment of inertia or a small center-of-gravity distance LB, and therefore is relatively easy to operate, and is therefore presumed to be suitable for swing motions in layer L1 in which large opening and closing motions of the face occur.

[0042] In contrast to layer L1, layer L6 is a group of swing motions in which both the first index and the second index are relatively small. In other words, swing motions belonging to layer L6 have small cocking motions and rotations, and therefore relatively small opening and closing motions of the face from the top to impact. In the embodiment of FIG. 9 , golf club head A is assigned as optimal for swing motions in layer L6 based on impact tests. As described above, golf club head A has a large moment of inertia or a large center-of-gravity distance LC, and therefore is presumed to be suitable for swing motions in layer L6 in which the opening and closing motions of the face are small.

[0043] Layer L3 is a group of swing movements in which the first index is relatively large and the second index is relatively small. In other words, the swing movements belonging to layer L3 are unbalanced swings with large cocking movements but small rotations. Therefore, rotation assistance is required. In the embodiment of FIG. 9 , golf club head C is assigned to layer L3 as the optimal golf club head. As described above, golf club head C has a short center-of-gravity distance LC and the smallest moment of inertia, making it a head that rotates easily, and therefore is presumed to be suitable for the swing movements of layer L3.

[0044] In the stratified data section 204, layer L2 is a boundary layer located between layers L1 and L3. In the impact test, two golf club heads B and C, which are suitable for layers L1 and L3, showed optimal results for the swing motion belonging to layer L2, and these were assigned.

[0045] In the stratified data section 204, layer L4 is a boundary layer located between layers L1 and L6. In the impact test, two golf club heads A and B, which are suitable for layers L6 and L1, have shown optimal results for the swing motion belonging to layer L4, and are therefore assigned to layer L6 and layer L1.

[0046] Furthermore, in the stratified data section 204, layer L5 is a boundary layer located between layers L3 and L6. In the impact test, two golf club heads A and C, which are suitable for layers L6 and L3, showed optimal results for the swing motion belonging to layer L5, and these were assigned.

[0047] Therefore, by referring to the stratified data section 204, the selection section 203 can determine to which of the layers L1 to L6 the swing indexes (first index and second index) of the player to be fitted belong, and select at least one of the candidate golf club heads assigned to the corresponding layer.

[0048] At least one (or two) of the candidate golf club heads selected by the selection unit 203 are displayed on the display unit 300. The display unit 300 is configured as, for example, a display or a printer. Through the display unit 300, the user can ascertain the golf club head that is suitable for the player to be fitted. Note that users include not only players, but also instructors, golf equipment developers, and anyone else who requires the results of a golf swing analysis.

[0049] As described above, according to the fitting system 1 and fitting method of the present embodiment, a golf club head suited to an individual swing motion can be easily identified and displayed.

[0050] FIG. 10 shows the results of a hitting test for a certain player using a golf club head selected by the fitting device 200 of this embodiment (Example). Meanwhile, FIG. 11 shows the results of a hitting test for a certain player using a golf club head other than the golf club head selected from the candidate golf club heads (Comparative Example). Five hits were taken for each test, and the trajectory of the ball, including the flight distance, height, and lateral deviation, was measured. The golf clubs in the Example and Comparative Example all use the same shaft. As is clear from a comparison of FIGS. 10 and 11 , the flight distance and directionality of the ball were significantly improved when the ball was hit using a golf club head suited to the swing motion.

[0051] Next, a similar hitting test was conducted on 29 players. The results showed that when hitting with the golf club head selected by the fitting device 200, the distance increased by an average of 10.8 yards, and the left-right deviation improved by approximately 8 yards, compared to when hitting with a golf club head other than the selected golf club head.

[0052] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above specific disclosure, and can be implemented in various modified forms within the scope of the technical idea described in the claims.

[0053] [Additional Notes] The present invention includes the following aspects.

[0054] [Present Invention 1] A golf club head fitting device comprising: an acquisition unit that acquires measurement data obtained by measuring a player's golf club swing motion using a measuring device; a calculation unit that calculates a swing index based on the measurement data; and a selection unit that selects at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index. [Present Invention 2] The golf club head fitting device according to Present Invention 1, wherein the swing index includes a first index that is an index related to a cocking motion of the swing motion and a second index that is an index related to a rotation about a shaft axis of the swing motion. [Present Invention 3] The golf club head fitting device according to Present Invention 1 or 2, further comprising a stratification data unit in which the swing index is stratified and the plurality of candidate golf club heads are assigned to each stratification, and the selection unit selects at least one golf club head suitable for the player based on the player's swing index and the stratification data unit. [Invention 4] The golf club head fitting device according to any one of Inventions 1 to 3, wherein the plurality of candidate golf club heads differ in at least one of head volume, moment of inertia, and center of gravity position. [Invention 5] The golf club head fitting device according to Invention 2, wherein the selection unit selects at least one golf club head with a large moment of inertia from the plurality of candidate golf club heads when the first index and the second index are relatively small. [Invention 6] The golf club head fitting device according to Invention 2 or 5, wherein the selection unit selects at least one golf club head with a large center of gravity distance LC, which is the distance from the shaft axis to the center of gravity of the head in the face-back direction, from the plurality of candidate golf club heads when the first index and the second index are relatively small.[Invention 7] A golf club head fitting device according to Invention 2, 5 or 6, wherein the selection unit selects at least one golf club head having a small moment of inertia from the plurality of candidate golf club heads when the first index and the second index are relatively large. [Invention 8] A golf club head fitting device according to Invention 2, 5, 6 or 7, wherein the selection unit selects at least one golf club head having a small center-of-gravity distance LB, which is the distance in the toe-heel direction of a straight line drawn perpendicularly from the center of gravity of the head toward the shaft axis, from the plurality of candidate golf club heads when the first index and the second index are relatively large. [Invention 9] A golf club head fitting device according to Invention 2, 5, 6, 7 or 8, wherein the selection unit selects at least one golf club head having a small center-of-gravity distance LC, which is the distance in the face-back direction from the shaft axis to the center of gravity of the head, from the plurality of candidate golf club heads when the first index is relatively large and the second index is relatively small. [Invention 10] A golf club head fitting method comprising the steps of: acquiring measurement data obtained by measuring a player's swing motion of a golf club with a measuring device, calculating a swing index based on the measurement data, and selecting at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index. [Invention 11] A golf club head fitting program causing a computer to execute the steps of: acquiring measurement data obtained by measuring a player's swing motion of a golf club with a measuring device, calculating a swing index based on the measurement data, and selecting at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index.[Invention 12] A golf club head fitting system comprising a measuring device for measuring a player's swing motion of a golf club, and the fitting device according to any one of Inventions 1 to 9.

[0055] The present invention can be applied to club fitting, which easily identifies a golf club head suited to each golf player's swing motion.

[0056] REFERENCE SIGNS LIST 1 fitting system 2 golf club 3 player 23 golf club head 24 stratified data section 200 fitting device 201 acquisition section 202 calculation section 203 selection section 204 stratified data section

Claims

1. A golf club head fitting device comprising: an acquisition unit that acquires measurement data obtained by measuring a player's golf club swing motion using a measuring device; a calculation unit that calculates a swing index based on the measurement data; and a selection unit that selects at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index.

2. A golf club head fitting device as described in claim 1, wherein the swing indicators include a first indicator which is an indicator related to the cocking motion of the swing motion, and a second indicator which is an indicator related to the rotation of the swing motion about the shaft axis.

3. The golf club head fitting device according to claim 1 or 2, further comprising a stratification data section in which the swing index is stratified and the plurality of candidate golf club heads are assigned to each stratification, and the selection section selects at least one golf club head suitable for the player based on the swing index of the player and the stratification data section.

4. The golf club head fitting device according to claim 3, wherein the plurality of candidate golf club heads differ in at least one of head volume, moment of inertia, and center of gravity position.

5. The golf club head fitting device according to claim 4, wherein the selection unit selects at least one golf club head having a large moment of inertia from among the plurality of candidate golf club heads when the first index and the second index are relatively small.

6. A golf club head fitting device as described in claim 4, wherein the selection unit selects, from the plurality of candidate golf club heads, at least one golf club head having a large center-of-gravity distance LC, which is the distance from the shaft axis to the center of gravity of the head in a face-back direction, when the first index and the second index are relatively small.

7. The golf club head fitting device according to claim 4, wherein the selection unit selects at least one golf club head having a small moment of inertia from among the plurality of candidate golf club heads when the first index and the second index are relatively large.

8. A golf club head fitting device as described in claim 4, wherein the selection unit selects, from among the plurality of candidate golf club heads, at least one golf club head having a small center-of-gravity distance LB, which is the distance in the toe-heel direction of a straight line drawn perpendicularly from the center of gravity of the head toward the shaft axis, when the first index and the second index are relatively large.

9. A golf club head fitting device as described in claim 4, wherein the selection unit selects, when the first index is relatively large and the second index is relatively small, from among the plurality of candidate golf club heads, at least one golf club head having a small center-of-gravity distance LC, which is the distance in a face-back direction from the shaft axis to the center of gravity of the head.

10. A golf club head fitting method comprising the steps of: acquiring measurement data obtained by measuring a player's golf club swing motion using a measuring device; calculating a swing index based on the measurement data; and selecting at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index.

11. A golf club head fitting program which causes a computer to execute the steps of: acquiring measurement data obtained by measuring a player's golf club swing motion using a measuring device; calculating a swing index based on the measurement data; and selecting at least one golf club head suitable for the player from a plurality of candidate golf club heads based on the swing index.

12. A golf club head fitting system comprising: a measuring device for measuring a swing motion of a golf club by a player; and the fitting device according to claim 1.

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