GAS FUEL INJECTION VALVE

A gas fuel injection valve is provided in which a valve housing (2) is equipped with a nozzle member (3) having a flat valve seat (8) and a nozzle hole (10) extending through its central part and a magnetic cylindrical body (4) joined thereto, the nozzle member (3) is made of a synthetic resin and is formed on its outer periphery with a first fitting part (11) fitted into a fitting connecting hole (18) of a front end part of the magnetic cylindrical body (4), a second fitting part (12) fitted into a mounting hole (1) of an intake path member (P1) of an engine, and a connecting recess (13) positioned between the two fitting parts (11, 12), the magnetic cylindrical body (4) and the nozzle member (3) are joined to each other by swaging toward the connecting recess (13) side a swage tube part (22) formed at the front end of the magnetic cylindrical body (4), and the second fitting part (12) is formed on its outer periphery with an annular seal groove (15) mounted with a seal member (17) that makes intimate contact with an inner peripheral face of the mounting hole (1) of the intake path member (P1). This enables a seal groove mounted with a seal member that comes into intimate contact with an inner peripheral face of a mounting hole of an intake path member of an engine to be formed without employing any special ring member.