Ignition circuit for squib for air bag device

An ignition circuit for squib (1) for igniting the a squib (1) which has a heat producing portion (3) includes an electrically conductive portion (11) and a fuel portion (12), and transmits a heat produced by supplying electrical current to the electrically conductive portion (11) to the fuel portion (12), having an electrical current boosting device (13) which steeply boosts electrical current supplied to the electrically conductive portion (11).