A machine tool equipped with a robot includes a stocker which has one or more effector holder units for holding an end effector to be mounted on the robot, in which the stocker can be stored within a casing of the machine tool. At least a part of the stocker is configured to be bilaterally advanceable into a machining chamber of the machine tool and an external region located outside the machine tool.

A machine tool equipped with a robot includes a stocker which has one or more effector holder units for holding an end effector to be mounted on the robot, in which the stocker can be stored within a casing of the machine tool. At least a part of the stocker is configured to be bilaterally advanceable into a machining chamber of the machine tool and an external region located outside the machine tool.

A replacement device of a processing apparatus includes a gripping device having a single first support member positionally fixed, a first gripping portion provided on the first support member to grip a holder not to rotate in a releasing direction when the processing member is removed from the holder, and a second gripping portion provided on the first support member apart from the first gripping portion to grip the holder not to rotate in a restricting direction when the processing member is attached to the holder, and a holding device having a single movable second support member, plural first holding portions provided on the second support member to respectively accommodate the processing member removed from the holder, and plural second holding portions provided on the second support member apart from the first holding portions to respectively accommodate the processing member that is to be attached to the holder.