An object of the present invention is to provide a highly reliable indoor unit of an air conditioner in which the sealing of a shutter is improved. An indoor unit (1) of an air conditioner includes an indoor heat exchanger (3), a body (2), a centrifugal fan (4), and a shutter (5). A plurality of discharge passages (P2, P3) for discharging air that has passed through the indoor heat exchanger (3) are formed in the body (2). The centrifugal fan (4) generates a flow of air that passes through the indoor heat exchanger (3) and is blown out of the discharge passages (P2, P3). The shutter (5) is provided to at least one discharge passage (P3) of the plurality of discharge passages (P2, P3). The shutter (5) is kept in a closed state by the pressure of the air flow.
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