It is an object of the invention to provide a power tool with a rational placement of a dynamic vibration reducer within a tool body. A representative hammer drill embodied as a power tool according to this invention has a dynamic vibration reducer 151 which is placed within an internal space 110 located to a motion converting section 113 side of a driving motor 111 within a body 103. An inner edge of the internal space is defined by an outer edge of the motion converting section 113, and an outer edge of the internal space is defined by an outer periphery of the driving motor 111.