An interior air filter for a motor vehicle has a fold pack having a first side. A material with a first leg and a second leg is disposed on the first side. The first leg is attached to the first side and the second leg has a width that is greater than a height of the fold pack. The material strip forms at least partially a head band or a side band of the fold pack. A filter receptacle for the interior air filter has a slanted wall and a mounting and removal opening through which the interior air filter is inserted or removed from the filter receptacle in a mounting and removal direction. The slanted wall extends at an angle that corresponds to an angle defined by the second leg of the material strip of the interior air filter and a contact surface of the filter receptacle.