A fuel-cell cartridge connector (1) comprising a connecting projection member (12) held in a cartridge case covering a fuel container containing fuel for a fuel cell, said connecting projection member having one end for insertion into the aforementioned fuel container and the other end for contact with and attachment to the front end of a fuel supply mouth. The connector is intended for removably connecting to an appliance that contains the fuel cell and has a connection portion that corresponds to the connecting projection member (12). The fuel-cell cartridge connector (1) is further provided with a rotation mechanism that allows rotation of the cartridge case [relative to the connector] when a rotating force that exceeds a predetermined value is applied to the cartridge in the condition when the connecting projection member is connected to the connection portion and the fuel receiving opening communicates with the fuel supply mouth.