An air conditioner comprising: an air cleaner that includes a charging unit to charge particles in air and a dust collecting unit to collect the particles charged by the charging unit by an electrostatic force; a filter cleaning device that includes: a device body to house a filter for capturing dust in the air in a movable form, a part of the device body forming a supporting part to support the air cleaner ; and a dust box that is removably attached to a front surface of the device body and accumulates the dust captured by the filter , another part of the device body forming a main receiving part to support the dust box ; and an indoor unit body that houses the filter cleaning device and removably houses the air cleaner behind the dust box by supporting it by the supporting part ; wherein: an insertion port is provided in the filter cleaning device , and both the air cleaner and the dust box are inserted into the insertion port ; the supporting part includes an auxiliary receiving part next to the main receiving part to support the dust box together with the main receiving part ; and upper surfaces of the main receiving part and the auxiliary receiving part form a wall surface of a lower side of the insertion port . an air cleaner that includes a charging unit to charge particles in air and a dust collecting unit to collect the particles charged by the charging unit by an electrostatic force; a filter cleaning device that includes: a device body to house a filter for capturing dust in the air in a movable form, a part of the device body forming a supporting part to support the air cleaner ; and a dust box that is removably attached to a front surface of the device body and accumulates the dust captured by the filter , another part of the device body forming a main receiving part to support the dust box ; and a device body to house a filter for capturing dust in the air in a movable form, a part of the device body forming a supporting part to support the air cleaner ; and a dust box that is removably attached to a front surface of the device body and accumulates the dust captured by the filter , another part of the device body forming a main receiving part to support the dust box ; and an indoor unit body that houses the filter cleaning device and removably houses the air cleaner behind the dust box by supporting it by the supporting part ; wherein: an insertion port is provided in the filter cleaning device , and both the air cleaner and the dust box are inserted into the insertion port ; the supporting part includes an auxiliary receiving part next to the main receiving part to support the dust box together with the main receiving part ; and upper surfaces of the main receiving part and the auxiliary receiving part form a wall surface of a lower side of the insertion port . an insertion port is provided in the filter cleaning device , and both the air cleaner and the dust box are inserted into the insertion port ; the supporting part includes an auxiliary receiving part next to the main receiving part to support the dust box together with the main receiving part ; and upper surfaces of the main receiving part and the auxiliary receiving part form a wall surface of a lower side of the insertion port . <EOS>