An image generating apparatus allowing reduction of the thickness of a heat radiation member and allowing strong mounting of a holding member also when a print head is arranged on the forward end of a screw member is obtained. This image generating apparatus comprises a print head, a heat radiation member, arranged on the upper surface of the print head, including a mounting portion protruding toward the head of a screw member and having a threaded hole meshing with the screw member and a holding member, mounted on the upper surface of the heat radiation member with the screw member, having a mounting portion receiving hole capable of receiving the mounting portion of the heat radiation member and holding a prescribed member.