In an automatic lay-up device that lays up a long sheet-shaped thermosetting prepreg on a layer surface by moving, in a lay-up direction, a lay-up head including a raw-cloth roller around which the thermosetting prepreg is wound, a cutting device that cuts the thermosetting prepreg at a cutting angle, and a pressing device that presses the thermosetting prepreg against the layer surface, the automatic lay-up device includes a driving mechanism for moving the pressing device in a direction parallel to the width direction; and a drive controller that controls driving of the driving mechanism to start moving the pressing device when a cutting end of the thermosetting prepreg reaches a position of the pressing device.