The utility model provides a portable cutting machine of using, it can restrain the limiter and warp. The portable cutting machine of using has: the support utilizes arm (23) of the power of engine (14) rotatory blade (24), circumferencial direction partly who covers blade (24), and can install in wheel protector (43) of arm (23) along the state of the circumferencial direction removal of blade (24) under, when the circumferencial direction removal of blade (24) is followed for arm (23) to a round protector (43), make arm (23) and jut (57) of taking turns protector (43) and stopping at the preposition for arm (23), and restrain contact site (58) and arm (23) that jut (57) warp in the crossing direction of the direction of the power with making wheel protector (43) stop.