CHANGER

PROBLEM TO BE SOLVED: To provide a changer for changing a multi-spindle head with respect to a machine tool with a small and simple configuration.SOLUTION: The changer 32a includes a base 80 supported on the carriage body 76 of a carriage 20 conveying the multi-spindle heads 14a, and an attaching/detaching mechanism 32a attaching/detaching the multi-spindle heads 14a to/from the machine tool 16. The attaching/detaching mechanism 32a includes: a transfer table 64 advancing/retreating in a horizontal direction with respect to the base 80; positioning members 126a, 126b which can be advance/retreated on the transfer table 64 and can be engaged with positioning blocks 127a, 127b provided to lower part of the multi-spindle head 14a; and a pressing-in member 122 which can be advanced/retreated by an advancing/retreating motor 128 on the transfer table 64, and in which a first tilted face 132 advancing the positioning members 126a, 126b in the engaging direction with the positioning blocks 127a, 127b by being advanced from an initial position and a second tilted face 134 pressing upward the multi-spindle head 14a, are provided in this order.