[Problem to be Solved] To provide an air hammer tool which largely reduces transmission of vibration to a worker, has a simple and light-weight structure, can he manufactured at a low cost, and can be easily maintained.[Solution] An air hammer tool. 1A has a single coil spring 9 (elastic body) externally fitted on the outer periphery of a cylinder portion 11 of a sliding body 8, the coil spring 9 as a compression spring is interposed between a spring stop member 16 which is fixed to the front end portion of a main body portion 3b and a front end face 10a of the sliding body 8, when a trigger 4a is operated, the sliding body 8 obtains a state where it is pushed forward by compressed air to elastically contract the coil spring 9, and the sliding body 8 obtains a rearward urged state