Abstract: A nailing machine having a cylinder housing which houses a cylinder which slidably houses a piston in communication with a source of compressed fluid for moving the piston within the cylinder, and a nail machine body which integrally includes a grip portion. A nail magazine and a nail feeder cooperate to feed a nail to the injection portion of the nailing machine. A bumper is arranged to collide with the lower surface of the piston during the nailing operation. The cylinder housing is coupled with the nail machine body so as to be movable in a nail-driving direction. A nail driver is in communication and moves integrally with the piston. A compressed fluid communication chamber is formed between the grip portion and the nailing machine body to move the piston and thereby the nail drives in a nail-driving direction.