Automobile pillar air bag device

Disclosed is an automobile pillar airbag device which is provided along the roof side rail from the front pillar of an automobile chassis to protect a passenger's head from impact in the broadside collision of the automobile. The automobile pillar airbag device includes: a sensor installed in a chassis, for sensing a broadside collision; a gas supply section installed in the chassis so as to inject a gas depending on a signal from the sensor; a bag (30) received extending from a front pillar (3) of the chassis to a roof side rail (5), and expanded in a curtain shape in the downward direction of the roof side rail of the interior of the automobile by a gas supplied from the gas supply section; a pillar trim (40) provided in an inner side of the front pillar (3) and covering the bag (30) received in the front pillar; and a pillar trim deviation preventive means including a strap (50) both ends of which are respectively connected with the front pillar and the pillar trim, and a screw (54) for coupling each end of the strap to the front pillar and pillar trim, respectively.