To facilitate combustion control by avoiding complication of the combustion control.

The evaporating fuel treatment device includes a fuel tank 31 for storing fuel, a fuel supply pipe 39 connecting the fuel tank 31 and an injector 61 of an engine 13, a fuel pump 37 for conducting by the fuel supply pipe 39 the fuel from the fuel tank 31 to the injector 61, and a canister 46 for adsorbing the evaporating fuel evaporating in the fuel tank 31. In the canister 46, evaporating-fuel supply pipes (first and second evaporative fuel supply pipes) 44, 45 are provided to connect the canister 46 with the injector 61, and a pressure pump 47 which removes the evaporating fuel adsorbed in the canister 46 by introducing fresh air into the canister 46 and pressurizing the evaporative fuel together with the fresh air to supply it to the injector 61 through evaporating fuel-supply pipes 44, 45.

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