Impact rotary tool

An impact rotary tool comprising:

• a hammer configured to rotate upon receiving motive power from a motor;
• an anvil configured to rotate upon receiving, from the hammer, impacting force in a rotational direction of the hammer;
• an output shaft configured to hold a tip tool thereon and rotate along with the anvil upon receiving, from the anvil, force in a rotational direction of the anvil;
• a housing that houses the hammer and the anvil;
• a bearing held by the housing and supporting the output shaft rotatably;
• and
• a buffer member including an elastic member configured to be elastically deformed in a thrusting direction aligned with a rotational axis of the output shaft,
• the anvil having a first facing region facing the output shaft in the thrusting direction,
• the output shaft having a second facing region facing the first facing region in the thrusting direction,
• the buffer member being interposed between the anvil and the output shaft,
• the elastic member being compressed in the thrusting direction under a load transmitted in the thrusting direction from the hammer,
• the buffer member being configured to regulate a gap distance between the second facing region and the first facing region such that when a maximum load is transmitted from the hammer to the elastic member, the second facing region faces the first facing region with a gap left between the second facing region and the first facing region in the thrusting direction.