Curtain airbag system

1. A curtain airbag system deployed to protect an occupant when a predetermined or greater side impact is applied to a vehicle, comprising:

an airbag housed at least in a roof side rail portion of the vehicle for covering at least a part of an interior side face of the vehicle when deployed to form a curtain-like inflatable body as a whole;

an inflator connected to said airbag for injecting gas into said airbag when the predetermined or greater side impact is applied to the vehicle, to thereby expand said airbag; and

a stretching member formed to extend along said airbag in a longitudinal direction of said vehicle,

said stretching member being attached to an inflatable portion of said airbag to maintain said airbag in a deployed state after an initial deployment thereof; wherein

said stretching member is provided to a lower end portion of said airbag and extends in the longitudinal direction of said vehicle;

said stretching member being provided only to that portion of said airbag which is housed in said roof side raid portion; and

said stretching member is housed in between a vehicle body component constructing said roof side rail portion of said vehicle and an interior member fixed onto a surface of said vehicle body component together with said airbag so that said stretching member is positioned under said airbag; and

said stretching member presses said interior member when said airbag is deployed, to thereby detach at least a part of said interior member from said vehicle body component.

2. The curtain airbag system according to claim 1 , wherein:

said stretching member reaches over at least two pillar portions of said vehicle at the time of deployment of said airbag.

3. The curtain airbag system according to claim 1 , wherein:

a material of said stretching member is resin.