INSTALLATION STRUCTURE

An installation structure includes: an air bag, disposed on an indoor side of a vehicle body; an interior, covering the air bag; and a fastener, connected with the interior and installed to the vehicle body. The fastener includes a vehicle body side component installed to the vehicle body and an interior side component installed to the interior. One of the vehicle body side component and the interior side component includes a male part. The other includes a female part engaged with the male part and including: a first wall, extending in an insertion direction where the fastener is inserted into the vehicle body; a second wall, parallel to the first wall; and an engagement part, provided on the first wall and engaged with the male part. When the male and female parts are engaged, a space is formed adjacent to the male part and between the first and second walls.