Vehicle having an airbag system

An airbag system (100) to be mounted to the upper part of the side wall of a vehicle includes an airbag (120) having a combination of a rolled-up second folded portion (122), a concertina-like third folded portion (123), and a first folded portion (121) extending downward from the base end so as to cover the sides of the second folded portion (122) and the third folded portion (123) form the interior side.