Abstract: A pneumatic hammer drill includes a handle body, a pneumatic cylinder, a piston, a tool, and a damping member. The handle body has an upper part that defines a front cavity and that has a rear end. The pneumatic cylinder has a cylinder rear end fitted in the front cavity, a front tool-connecting end, and a pressure chamber. The piston is disposed slidably in the pressure chamber. The tool is inserted into the pressure chamber through the front tool-connecting end. The damping member is made of a vibration-damping material, and is attached to the rear end of the handle body.