INFLATOR THAT CAN EASILY BE INSTALLED

The present invention provides a method of attaching an inflator to a module case. The present invention is a method of attaching an inflator to a module case which comprises the following assembling processes 1 to 4. Process 1: fixing an inflator housing by fixing means. Process 2: attaching a positioning jig at an opening portion of the tube-like connecting member in the side to which the module case is connected, making the an opening portion of the tube-like connecting member in the side to which the module case is connected abut against the diffuser portion surface and, at the same time, adjusting the attaching direction (the angle formed by the center axis of the diffuser portion and the center axis of the tube-like connecting member) of the tube-like connecting member. Process 3: fastening a connecting portion of the diffuser portion and the tube-like connecting member from the outside by fastening means to fix them. Process 4: removing the positioning jig and inserting the tube-like connecting member into the module case.