To provide an ignitor preventing cracks in solder for fixing an ignitor drive element and having high reliability with its long service life.

In the ignitor, wherein a substrate arranged with electronic components thereon is mounted on a heat sink and a drive element disposed with a predetermined distance from the substrate is provided on the heat sink, wherein the substrate is bonded and fixed on the heat sink with an adhesive, and wherein mold resin is injected and hardened in an ignitor case part after the heat sink has been disposed in the ignitor case part, partitioning work is performed between the substrate and the drive element on the heat sink surface.