To provide a rotatably laminating unit capable of punching a plate material with a single device and accurately laminating the punched plate materials at high speed by rotating each plate material at a designated angle.

The rotatably laminating unit includes a die holder which has a die mounting section for mounting a lower die and a part storage section for storing punched plate-like parts and further has an outer peripheral surface wherein a horizontally cross-sectioned contour is a circular shape and a holder support member which has an inner peripheral surface for surrounding an outer peripheral surface of the die holder and rotatably supporting the die holder. A first V-shaped groove is directly formed on the outer peripheral surface of the die holder, and an inner peripheral surface of the holder support member has a second V-shaped groove opposite to the first V-shaped groove. A cross roller bearing is configured in a way that a plurality of rolling bodies rotating in contact with the first V-shaped groove and second V-shaped groove are interposed between the die holder and holder support member and rolling axes of neighboring rolling bodies among the plurality of rolling bodies are mutually crossed to be perpendicular.