WORKING MACHINE

It is possible to flexibly change output depending on work. A working machine (1) comprises: a machine body (2); an engine (60) provided on the machine body (2): a motor/generator to perform an assisting action in which the motor/generator functions as a motor to assist the engine in driving and an electricity generating action in which the motor/generator functions as a generator (63) to generate electricity using power from the engine (60); a working device (3) configured to function using power from the engine (60) and the motor/generator; a work operation member (37) for operation of the working device (3); an action control unit (70d) to cause the assisting action to be performed when a rotation speed of the engine (60) is equal to or less than a first rotation speed and cause the electricity generating action to be performed when the rotation speed of the engine is equal to or greater than a second rotation speed, the second rotation speed being greater than the first rotation speed; and a switching changing unit to change the first rotation speed or the second rotation speed according to an operation amount of the work operation member (37).