Patent ID: 8875604

Claim:
A machine tool comprising: a front spindle; a back spindle disposed so as to be opposed to the front spindle; a front tool post disposed so as to be opposed to the front spindle and holding a plurality of front working tools; and a back tool post disposed so as to be opposed to the back spindle and holding a plurality of back working tools, characterized in that: the front and back working tools are arranged on the front and back tool posts, respectively, in a plurality of tiers in a Y-axis direction intersecting with axis lines of the respective front and back spindles; the front tool post and the back spindle are provided so as to be integrally movable in the Y-axis direction; and one of the plurality of tiers of the front working tools corresponding to the front spindle and another one of the plurality of tiers of the back working tools corresponding to the back spindle is switched by moving the back spindle in the Y-axis direction.