An igniter having an igniter element, a bushing, adhesive and sealant is provided. The igniter element has a polarizing key for generating heat at a high temperature. The bushing is inserted on an outside of one end of the igniter element. The adhesive is placed in a bushing cavity for bonding the bushing with the igniter element. The sealant covers both the bushing and the adhesive placed in the cavity of the bushing thereby joining the bushing and adhesive and improving joining structures of components.