PURPOSE: To prevent the overflow state from being judged by mistake as the generation of abnormality by closing a purge passage once when the internal temperature of a canister is not lowered after the opening of a purge passage, and letting the canister suck evaporated fuel.

CONSTITUTION: A canister 3 sucks evaporated fuel generated from a fuel tank 2, and a purge passage 5 leads the fuel sucked to the canister 3 into the intake passage 4 of an engine 1. A control unit 20 controls the switching of a purge control valve 14 by a purge cutoff valve 17 so as to close the purge passage 5 once when the internal temperature of the canister 3 detected by a temperature sensor 7 is not lowered after the opening of the purge passage 7 and to let the canister 3 suck the evaporated fuel. The purge passage 5 is reopened, and abnormality is judged when the internal temperature of the canister 3 is still unlowered. The overflow state of the canister 3 is thereby prevented from being judged by mistake as the failure of a canister device.