Abstract: An automatic tools changing method and apparatus for a multi-spindle machine tool, in which a tools changing operation between spindles and a tool magazine or magazines is carried out simultaneously through at least one tool-changing arm movable between the spindles and the tool magazine or magazines. For this reason, the spindles are arranged at predetermined intervals and pots of the tool magazine or magazines for storing tools and grasping members on the tool-changing arm or arms are arranged at positions corresponding to the positions of the spindles to receive or deliver the tools simultaneously.