A side airbag for a motor vehicle comprises an airbag shell that surrounds a gas compartment and has at least one opening. The collision load receiving portion is positioned in front of the rear orthogonal plate portion and is spaced downward from the screw rod and integrated with the rear support member that is mounted to the screw rod. The latch member may be slidably to locate between the arcuate portion of the flexible arm so as to prevent the flexible arms to be operated inadvertently or forcefully to release the engagement between the male plug and the female receptacle.