PROBLEM TO BE SOLVED: To provide a work machine capable of reducing a load on an engine in revolution of a machine body due to a crawler travel device.SOLUTION: A work machine includes: an engine 37 mounted to a machine body 11 a pair of right and left crawler travel devices 10 driven by power of the engine 37, and making the machine body 11 travel by itself a reciprocal flow fan 41 as equipment A driven by power of the engine 37 and a control unit 101 as a load reduction unit reducing a load on the engine 37 generated by driving of the reciprocal flow fan 41 as the equipment A, in revolution of the machine body 11 due to the pair of right and left crawler travel devices 10.