The invention provides a power operation machine capable of effectively reducing the temperature rise of a carburetor installed in an intake system of an internal combustion engine after stopping of an internal combustion engine at a low cost, without affecting the appearance (external dimension) and improving the restart performance of the internal combustion engine. An opening (25a) to which a suction pipe (15) is fitted is disposed in a mounting plate (23) on which a carburetor (13) is mounted, the suction pipe (15) has a suction passage (15a) connecting a suction passage (13a) of the carburetor (13) to a suction port (11a) of the internal combustion engine (11), and a plurality of ribs (24) arranged at intervals around the opening (25a) on the carburetor-mounted rear surface at the side of the internal combustion engine (11) of the mounting plate (23).