Patent ID: 7267056

Claim:
An initiator, comprising: a conductive header formed from a conductive metal into a tubular shape; a first lead pin integrally assembled to the conductive header; a second lead pin integrally assembled to a hole formed in the conductive header via an insulating member and penetrating the conductive header and the insulating member; a bridge wire connected between an inner end of the second lead pin and an inner end of the conductive head and generating heat upon supply of electricity thereto; and a cup-shaped casing airtightly fixed, at an open end portion, to an outer circumference of the conductive header and accommodating, in a sealed condition, the bridge wire and an explosive which detonates in response to heat generation of the bridge wire, wherein the hole of the conductive header and the insulating member fitted into the hole have respective taper portions in a region where the insulating member is joined to the conductive header, the taper portions have diameters that decrease with increasing distance from the explosive, and the taper portions are provided continuously over the entire region where the insulating member is joined to the conductive head.