An automatic lathe (10), comprising a first spindle (14) having a rotating axis (14a), a first tool post (18) capable of holding a plurality of tools (22) in parallel with each other, a second tool post (20) capable of holding the plurality of tools (22) in parallel with each other on each of first and second rows showing the blade tip directivities different from each other, and a second spindle (16) having a rotating axis (16a) in parallel with the rotating axis of the first spindle and capable of being disposed opposedly to the first spindle, all mounted collectively on a lathe frame (12), wherein the first spindle is allowed to be moved linearly along a first control shaft in parallel with the rotating axis of the first spindle, the first tool post is allowed to be moved linearly along a second control shaft crossing perpendicular to the first control shaft, the second tool post is allowed to be moved linearly along a third control shaft crossing perpendicular to the first control shaft and along a fourth control shaft in parallel with the first control shaft, and the second spindle is allowed to be moved linearly along a fifth control shaft in parallel with the third control shaft and along a six control shaft in parallel with the first control shaft, whereby a control device (106) is allowed to simultaneously perform a first machining operation related to the first spindle using a desired tool selected by the first tool post, a second machining operation related to the first spindle using a desired tool selected from the first row by the second tool post, and a third machining operation related to the second spindle using a desired tool selected from the second row by the second tool post.