A shock-reducing claw hammer includes a hammerhead, a handle and a restraining element. The hammerhead includes a hitting portion formed at an end and two claws formed at another end. The handle is connected to the hammerhead and formed with a bore, a gap in communication with the bore, and a reduced portion so that the bore is located between the gap and the reduced portion. The restraining element includes a flat body and two end tabs extending from the flat body. The flat body is supported on the handle. One of the end tabs is movably inserted in the wide slit. The other end tab is fitted in the narrow slit.