An automatic lay-up machine includes a head device and a support mechanism. The head device includes a sheet supplying unit that supplies a prepreg sheet including sheet-shaped prepreg and release paper bonded to a surface of the prepreg, a lay-up unit that lays up the prepreg on a receiving surface by pressing the prepreg sheet against the receiving surface, and a sheet take-up unit that takes up the release paper separated from the prepreg. The support mechanism supports the head device and includes a mechanism for moving the head device in a lay-up direction of the prepreg and a width direction of the prepreg sheet. The head device is moved in the width direction while a position of an edge of the prepreg sheet coincides with a lay-up position and an end portion of the prepreg sheet is pressed against the receiving surface.