GAS PRODUCER

A gas generator which is inexpensive and easily assembled is provided. [0002] A cup body 20 loaded with a gas generating agent 24 and an igniter collar 14 holding an igniter main body 12 are connected and fastened in a way in which they are joined at a flange portion 20a and at an upper flat circumferential edge 15a, crimped by an upper end side 31 of a bent portion of a crimp case 30, and a lower flat circumferential edge 15b of a igniter collar 14 is crimped by a lower end side 32 of the bent portion of a crimp case 30. This is suitable as a gas generator for a pretensioner.