Abstract: The constitution has (a) an outdoor unit, and (b) an indoor unit including a wind circuit unit having an air suction port, a heat exchanger and blowing means, an air stream control unit having an air diffuser and air stream control means, and an electrical unit having an electric control device and an electric circuit. At least one of the wind circuit unit, the air stream control unit, and the electrical unit is formed separately, and the one unit and the remaining units of the plurality of units are mutually assembled integrally to form the indoor unit. The indoor unit composed of the wind circuit unit, air stream control unit, and electrical unit possesses a front surface having a continuous pattern. In this constitution, it is possible to obtain an indoor unit of an air conditioner having such effects as excellent appearance, small number of parts, enhanced ease of disassembling, excellent working efficiency in mounting, and excellent working efficiency in repair service.