A fuel supply adapter device includes an apparatus having a fuel injection unit containing a generation unit formed by a fuel cell and a fuel cartridge having a fuel supply unit and connected to the apparatus for sending fuel from the fuel cartridge to the generation unit side. The fuel supply adapter device includes a second connector for making a connection with a fuel injection unit of at least one device; a first connector for making a connection with a fuel supply unit of at least one fuel cartridge; a connection pipe which connects the first connector to the second connector; and a holder. The holder holds the first connector and the second connector.
