A cooling device includes a radiator, a tank, a circulation pipe, and a storage pool. The radiator dissipates heat of cooling medium. The tank stores the cooling medium. The circulation pipe allows the cooling medium to be conveyed from the radiator to the tank. The storage pool stores the cooling medium that has leaked from the tank. The tank includes a connector and a channel member. The connector connects the circulation pipe and the tank so that the circulation pipe communicates with an inside of the tank. The channel member guides the cooling medium leaking from the connector to the storage pool.