In a fuel tank for a vehicle in which a lower opening part of a fuel supply guide tube is covered with a flame arrester, to enable a fuel to be extracted via a fuel supply port. In the fuel tank for a vehicle provided with a fuel supply port device, the fuel supply port device includes an insertion hole through which the inside of the fuel supply port device and the inside of a tank body communicate with each other and through which a tool for extracting the fuel is inserted, and an open-close lid for opening and closing the insertion hole.