A safety joint including: a nozzle side member with a flow path formed inside, a shutoff valve of the nozzle side member opens when the nozzle side member is connected to a filling apparatus side member; and the filling apparatus side member with a cylindrical shape, a flow path in communication with the flow path of the nozzle side member is formed when the filling apparatus side member is connected to the nozzle side member; and when the nozzle side member is disconnected from the filling apparatus side member, the flow paths (1A, 21A) of the nozzle side member and the filling apparatus side member are shut off, wherein said filling apparatus side member has an opening that communicates with the flow path of the filling apparatus side member and extends orthogonally to the flow path of the filling apparatus side member; when the nozzle side member and the filling apparatus side member are connected, a protruding portion of the nozzle side member is inserted into the opening on the filling apparatus side; and a filling apparatus side member flow path blocking mechanism is provided to instantly close the flow path of the filling apparatus side member at an initial stage when the nozzle side member is disconnected from the filling apparatus side member, wherein said filling apparatus side member flow path blocking mechanism includes a valve body provided in the flow path of the filling apparatus side member, an elastic member on the filling device side that urges the valve body, and a support member for supporting a valve body of the filling apparatus side member, wherein said support member is placed on a rotational shape member when the nozzle side member and the filling apparatus side member are connected, and moves to a state in which the support member does not support the valve body on the filling device side at the initial stage when the nozzle side member is disconnected from the filling apparatus side member, wherein said rotational shape member is provided with a folded-back portion, after the support member moves to a state in which the support member does not support the valve body on the filling device side at the initial stage when the nozzle side member is disconnected from the filling apparatus side member, the folded-back portion of the rotational shape member moves to a position surrounding the support member. the filling apparatus side member with a cylindrical shape, a flow path in communication with the flow path of the nozzle side member is formed when the filling apparatus side member is connected to the nozzle side member; and when the nozzle side member is disconnected from the filling apparatus side member, the flow paths (1A, 21A) of the nozzle side member and the filling apparatus side member are shut off, wherein said filling apparatus side member has an opening that communicates with the flow path of the filling apparatus side member and extends orthogonally to the flow path of the filling apparatus side member; when the nozzle side member and the filling apparatus side member are connected, a protruding portion of the nozzle side member is inserted into the opening on the filling apparatus side; and a filling apparatus side member flow path blocking mechanism is provided to instantly close the flow path of the filling apparatus side member at an initial stage when the nozzle side member is disconnected from the filling apparatus side member,