To provide the restraint device of a car for dissolving the defect following the usual housing shape for a blasting propulsive explosive so as to design an air bag module freely and easily so as to suit for the existing installation space.

This restraint device for a car is provided with an inflatable air bag for defining an inside volume and a gas generator having a blasting propulsive explosive, consisting of a dense body of a blasting material, for generating a gas at the inflation time of the air bag. The dense body of a blasting material includes an adhesive for making the body dense and making it a rigid prescribed shape body 1, which has the surface exposed to the inside volume of the air bag or the dense body is filled in a flexible packed body, which has the surface exposed to the inside volume of a gas bag 7. Favorably, the dense body has a texture with an extensible property and can knead the dense body.