[Problem] To provide a vehicle side airbag apparatus which can eliminate the operation of joining baffles sectioning the inside of a side airbag into three chambers, facilitate and simplify the assembly operation thereof, easily and skillfully manufacture the side airbag, and improve productivity.
[Resolution Means] In the state in which a side airbag is folded and stored, each of first and second baffles 5, 6 is provided facing each other in the width direction of the vehicle such that two surfaces on both sides of a ridge line Q extending in the longitudinal direction of this baffle are able to at least partially overlap each other, the side airbag includes a baffle intersection which is formed by allowing the first baffle to cross the second baffle, and this baffle intersection is partially formed at a predetermined position of the ridge line of the second baffle, in addition to having a crossover opening 16 at which the first baffle penetrates through the second baffle.