In constituting an air conditioner case by bonding a first case member having a cooling air intake chamber and a second case member that is not provided with a cooling air intake chamber, the cooling air intake chamber is formed in a direction that is perpendicular to an air intake port and a blower mounting hole, opening via an opening portion. A mounting plate provided with a regulator is mounted at the opening portion. Thus, since a partitioning wall and barrier walls defining the periphery of the cooling air intake chamber can be formed at the same time as the formation of the case main body of the first case member, it is not necessary to further divide the first case member.