Abstract: Apparatus for automatic tool changing, such apparatus being situated between the lathe rest and the stationary tool magazine of the lathe. The total changing apparatus contains a basic support frame which can move parallel to the axis of the lathe spindle; a transport unit for following cross-traverse on the support frame, a two-seat tool magazine, and a mechanism for straight-lined translation of the tool units. The basic support frame contains a brace structure and a beam. The brace structure extends along a guideway towards the body of the lathe, while the beam acts as a guideway for the transport unit. The two-seat tool magazine includes a slide fixed to the transport unit; it can move along the beam of the support frame together with the transport unit, as well as independently. It also contains two seats for tool units, rigidly fastened to the slide.