To provide a machine tool that is no need to maintain a large space around a tool unit and to limit a turning angle of the tool unit, an automatic lathe (100) includes a front main spindle (20) holding a workpiece W and a turret (31) including a peripheral surface, the peripheral surface being divided into a plurality of turret surfaces (31n, 31c, ..., 31k), tools (40, 61, 62, 63, 64, 65) being mounted on the turret surfaces (31n, 31c, ..., 31k), the turret machining the workpiece (W) with any of the tools selected by turning about a Z axis, wherein at least one turret surface (31n) of the turret surfaces of the turret (31) has a distance from the Z axis shorter than that of the other turret surfaces (31c-31k).