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.