A turret tool rest includes a main shaft for rotating a tool, a mill housing including a mill housing connection shaft into which the main shaft is inserted, a turret turning shaft into which the mill housing connection shaft is inserted, a turret to which one end of the turret turning shaft is fixed, a joint base fixed to one end of the mill housing connection shaft, and a turret base which supports the turret turning shaft. The mill housing is disposed inside the turret. The joint base includes an engagement mechanism which switches between coupling to the turret base and coupling to the turret turning shaft.