A gas generator includes a cup where a gas generating agent is accommodated and a holder. The holder includes a first recessed portion and an annular groove provided in an end surface on a side facing the cup, a second recessed portion provided in an end surface on an opposite side, and a partition between the first and second recessed portions. A bottom surface of the first recessed portion includes a first and second bottom surface located on a side of the second recessed portion. The gas generator satisfies A<B<C, where A represents a distance from the second bottom surface to a bottom surface of the second recessed portion, B represents a distance from the first bottom surface to the bottom surface of the second recessed portion, and C represents a distance from the bottom surface of the second recessed portion to the annular groove.

An integral harness belt tensioning and load limitation system for a child seat is provided. The integral harness belt tensioning system includes a belt tensioner and a belt force load limiter that is in the load path of the integral harness. The harness belt tensioning mechanism is activated by a drive module upon the child seat reaching a predetermined acceleration threshold. If acceleration limits are reached, the drive module is triggered, an energy charge is released, and the harness belt is tightened via a rotary or linear tensioning mechanism. The load limitation system limits the amount of tension applied to the harness belt.