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An igniter assembly includes, an igniter body having an ignition portion and an electroconductive pin, a substantially cylindrical collar surrounding and retaining the igniter body, and a tubular holder disposed inside the collar and surrounding the electroconductive pin to connect the electroconduc

An igniter assembly includes, an igniter body having an ignition portion and an electroconductive pin, a substantially cylindrical collar surrounding and retaining the igniter body, and a tubular holder disposed inside the collar and surrounding the electroconductive pin to connect the electroconductive pin to a connector. The igniter body, the collar, and the tubular holder are separate members, and are integrated by a resin (provided that the holder is not fitted by being inserted into the collar or a resin portion covering the collar). The tubular holder has a tubular body portion and a convex portion covered by the resin and formed on an outer circumferential surface of the tubular body portion in the diametrical direction or on an inner circumferential surface of the tubular body portion in the diametrical direction. A fitting portion is provided to the inner circumferential surface of the tubular body portion for fitting the connector.

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1. An igniter assembly comprising: an igniter body having an ignition portion and an electroconductive pin;a substantially cylindrical collar surrounding and retaining the igniter body; anda tubular holder disposed inside the collar and surrounding the electroconductive pin to allow the electrocondu

1. An igniter assembly comprising: an igniter body having an ignition portion and an electroconductive pin;a substantially cylindrical collar surrounding and retaining the igniter body; anda tubular holder disposed inside the collar and surrounding the electroconductive pin to allow the electroconductive pin to be connected to a connector connected to a lead wire for supplying ignition current to the electroconductive pin to activate the igniter body, the tubular holder defining, therein, an open internal space for receiving and accommodating the connector,the igniter body, the collar and the tubular holder, being separate members from one another, being integrated by a resin,the tubular holder having a tubular body portion and a convex portion extending from the tubular body portion in the diametrical direction of the tubular holder, at least the convex portion being covered by the resin, and the open internal space being defined by an inner circumferential surface of the tubular body portion exposed to the open internal space and the resin such that the electroconductive pin protrudes from the resin to the open internal space, and the connector being configured to be connected to the electroconductive pin within the open internal space, andthe tubular holder having a fitting portion formed in the inner circumferential surface of the tubular body portion, the fitting portion being configured to engage with an engaging portion, provided to the connector, when the connector is received in the open internal space to prevent the connector from disconnecting from the electroconductive pin. 2. The igniter assembly according to claim 1, wherein the convex portion protrudes inward or outward at a desired height of the tubular body portion. 3. The igniter assembly according to claim 1, wherein the convex portion is of a flange shape or a reverse flange shape formed at an opening of the tubular body portion, on the side closer to the igniter body. 4. The igniter assembly according to claim 1, wherein the convex portion is formed as an annular protrusion or a plurality of independent protrusions. 5. The igniter assembly according to claim 1, wherein the cross sectional shape in the diametrical direction at a portion having no convex portion of the tubular body portion is polygonal. 6. An igniter assembly comprising: an igniter body having an ignition portion and an electroconductive pin;a substantially cylindrical collar surrounding and retaining the igniter body; anda tubular holder disposed inside the collar and surrounding the electroconductive pin to allow the electroconductive pin to be connected to a connector connected to a lead wire for supplying ignition current to the electroconductive pin to activate the igniter body, the tubular holder defining, therein, an open internal space for receiving and accommodating the connector,the igniter body, the collar and the tubular holder being separate members from one another, being integrated by a resin,the tubular holder having a tubular body portion and a concave portion formed in one of an outer circumferential surface and an inner circumferential surface of the tubular body portion in a thickness direction of the tubular main body portion, at least the concave portion being covered by the resin, and the open internal space being defined by an inner circumferential surface of the tubular body portion exposed to the open internal space and the resin such that the electroconductive pin protrudes from the resin to the open internal space, and the connector being configured to be connected to the electroconductive pin within the open internal space, andthe tubular holder having a fitting portion formed in the inner circumferential surface of the tubular body portion, the fitting portion being configured to engage with an engaging portion, provided to the connector, when the connector is received in the open internal space to prevent the connector from disconnecting from the electroconductive pin. 7. The igniter assembly according to claim 6, wherein the concave portion is recessed inward at a desired height of the tubular body portion, and includes a plurality of recesses formed in the circumferential direction of the tubular body portion. 8. The igniter assembly according to claim 6, wherein the concave portion is formed in the vicinity of an opening of the tubular body portion, on the side closer to the igniter body. 9. The igniter assembly according to claim 2, wherein the convex portion protrudes inward. 10. The igniter assembly according to claim 1, wherein at least a portion of the collar extends between the ignition portion and the tubular holder. 11. The igniter assembly according to claim 1, wherein the convex portion extends in a direction parallel to a portion of the collar that extends between the ignition portion and the tubular holder. 12. The igniter assembly according to claim 6, wherein the concave portion is formed in the outer circumferential surface of the tubular body portion. 13. The igniter assembly according to claim 12, wherein the concave portion opposes at least a portion of the cylindrical collar. 14. The igniter assembly according to claim 8, wherein the concave portion is formed in the vicinity of the opening of the tubular body portion, on the side closer to the igniter body compared to the fitting portion. 15. The igniter assembly according to claim 6, wherein at least a portion of the collar extends between the ignition portion and the tubular holder.