A collision performance evaluation test method for an automobile body part for conducting a collision performance evaluation test for an automobile body part, the collision performance evaluation test method comprising supporting one end portion and another end portion of the automobile body part with a support jig (2, 3), respectively, and disposing a motion control mechanism (4, 5) on at least one of the support jig that supports one end portion of the automobile body part and the support jig that supports the other end portion of the automobile body part, in which: the motion control mechanism (4, 5) has a fixed member (4b, 5a) that is fixed to a motion restriction member (2a, 3a) of the support jig (2, 3) and a movable member (4a, 5b) that is so connected to the fixed member (4b, 5a) as to be movable in a predetermined direction with respect to a collision direction of a collision punch and also fixed to the one end portion or the other end portion of the automobile body part; a compression member (4c, 5c) protruding from one of the fixed member (4b, 5a) and the movable member (4a, 5b) toward the other is fitted in a motion-restriction state into a guide portion (4e, 5e), which is formed on the other of the fixed member (4b, 5a) and the movable member (4a, 5b) so as to extend in the movable direction of the movable member (4a, 5b) and is disposed with an energy-absorbing member (4d, 5d) therein, and deforms the energy-absorbing member (4d, 5d) by motion of the movable member (4a, 5b) with respect to the fixed member (4b, 5a) in the predetermined direction to apply reaction force to the movable member (4a, 5b) in a direction opposite to the direction of the motion; the collision punch is made collide with the automobile body part in the collision direction at a test speed; and the reaction force in the opposite direction is applied via the motion control mechanism (4, 5) to an end portion (1a, 1b), which is supported by the support jig (2, 3) provided with the motion control mechanism (4, 5) out of the one end portion and the other end portion of the automobile body part, to control the motion of the end portion (1a, 1b). supporting one end portion and another end portion of the automobile body part with a support jig (2, 3), respectively, and disposing a motion control mechanism (4, 5) on at least one of the support jig that supports one end portion of the automobile body part and the support jig that supports the other end portion of the automobile body part, in which: the motion control mechanism (4, 5) has a fixed member (4b, 5a) that is fixed to a motion restriction member (2a, 3a) of the support jig (2, 3) and a movable member (4a, 5b) that is so connected to the fixed member (4b, 5a) as to be movable in a predetermined direction with respect to a collision direction of a collision punch and also fixed to the one end portion or the other end portion of the automobile body part; a compression member (4c, 5c) protruding from one of the fixed member (4b, 5a) and the movable member (4a, 5b) toward the other is fitted in a motion-restriction state into a guide portion (4e, 5e), which is formed on the other of the fixed member (4b, 5a) and the movable member (4a, 5b) so as to extend in the movable direction of the movable member (4a, 5b) and is disposed with an energy-absorbing member (4d, 5d) therein, and deforms the energy-absorbing member (4d, 5d) by motion of the movable member (4a, 5b) with respect to the fixed member (4b, 5a) in the predetermined direction to apply reaction force to the movable member (4a, 5b) in a direction opposite to the direction of the motion; the collision punch is made collide with the automobile body part in the collision direction at a test speed; and the reaction force in the opposite direction is applied via the motion control mechanism (4, 5) to an end portion (1a, 1b), which is supported by the support jig (2, 3) provided with the motion control mechanism (4, 5) out of the one end portion and the other end portion of the automobile body part, to control the motion of the end portion (1a, 1b). the motion control mechanism (4, 5) has a fixed member (4b, 5a) that is fixed to a motion restriction member (2a, 3a) of the support jig (2, 3) and a movable member (4a, 5b) that is so connected to the fixed member (4b, 5a) as to be movable in a predetermined direction with respect to a collision direction of a collision punch and also fixed to the one end portion or the other end portion of the automobile body part; a compression member (4c, 5c) protruding from one of the fixed member (4b, 5a) and the movable member (4a, 5b) toward the other is fitted in a motion-restriction state into a guide portion (4e, 5e), which is formed on the other of the fixed member (4b, 5a) and the movable member (4a, 5b) so as to extend in the movable direction of the movable member (4a, 5b) and is disposed with an energy-absorbing member (4d, 5d) therein, and deforms the energy-absorbing member (4d, 5d) by motion of the movable member (4a, 5b) with respect to the fixed member (4b, 5a) in the predetermined direction to apply reaction force to the movable member (4a, 5b) in a direction opposite to the direction of the motion; the collision punch is made collide with the automobile body part in the collision direction at a test speed; and the reaction force in the opposite direction is applied via the motion control mechanism (4, 5) to an end portion (1a, 1b), which is supported by the support jig (2, 3) provided with the motion control mechanism (4, 5) out of the one end portion and the other end portion of the automobile body part, to control the motion of the end portion (1a, 1b).