Pretensioner and seat belt device

A pretensioner comprising:

• a wire connected to webbing that restrains an occupant;
• a piston disposed to the wire;
• a cylinder that slidably accommodates the piston;
• a gas generator that applies driving force to the piston;
• and
• a housing that integrally connects the cylinder and the gas generator, wherein
• the housing comprises an insertion hole that guides the wire, a communication part that is communicated with the cylinder and the insertion hole, and a gas-supply port that supplies gas generated by the gas generator to the communication part, and
• the pretensioner includes a wire guide disposed at a boundary portion of the insertion hole and the communication part, and a holding member that is inserted into the communication part and locked to the gas-supply port, thereby to position the wire guide,
• wherein the housing comprises a key groove formed axially on the holding member, and the holding member has a protrusion that can be inserted into the key groove.

A pretensioner comprising:

• a wire connected to webbing that restrains an occupant;
• a piston disposed to the wire;
• a cylinder that slidably accommodates the piston;
• a gas generator that applies driving force to the piston;
• and
• a housing that integrally connects the cylinder and the gas generator, wherein
• the housing comprises an insertion hole that guides the wire, a communication part that is communicated with the cylinder and the insertion hole, and a gas-supply port that supplies gas generated by the gas generator to the communication part, and
• the pretensioner includes a wire guide disposed at a boundary portion of the insertion hole and the communication part, and a holding member that is inserted into the communication part and locked to the gas-supply port, thereby to position the wire guide,
• wherein the housing comprises a key groove formed axially on the holding member, and the holding member comprises a main body that is made of resin and in a cylindrical shape, a protrusion that is formed on the main body and can be inserted into the key groove, a projection that is formed on the protrusion and lockable to the gas-supply port, and a rib formed axially on a surface of the main body.