Gas fuel supply apparatus

A gas fuel supply apparatus includes: first and second mouthpiece attachment sections (64, 65) capable of detachably attaching thereto mouthpieces (61, 62) of first and second gas containers (14, 15) and provided in communication with each other; and first and second check valves (71, 72) provided in a communication passage (68), communicating between the mouthpiece attachment sections (64, 65), in corresponding relation to the first and second gas containers (14, 15). The first and second check valves (71, 72) prevent a gas fuel, let out from any one of the first and second gas containers, from flowing into the other of the gas containers.