To perform switching of the rotational direction of a motor by a position shifting operation of a handle.

In a circular saw, a handle 30 is configured to be mountable either on a first mounting position, in which a base is advanced with its front part facing frontward, or on a second mounting position, in which the base is advanced with its rear part facing frontward. A rotational direction switching means 43 is provided to the handle 30 and a motor housing 14h for switching the rotational direction of the motor 14 by the shifting operation of the mounting position of the handle 30 relative to the motor housing 14h.