To improve suction distribution at scroll intake openings of scroll casings in a blowing device and an air conditioner with a centrifugal blower comprising impellers and the scroll casing and disposed in a unit casing having a unit intake opening.

The air conditioner 1 comprises the centrifugal blower 3 and the unit casing 2 storing the centrifugal blower 3. The centrifugal blower 3 includes the impellers 31a-31d and the scroll casings 32a-32d storing the respective impellers 31a-31d. The unit casing 2 has the unit intake opening 2a opened in a direction intersecting with opening directions of the scroll openings 34a-34d. Swelling parts 61a-61d with inner surfaces having a shape uniform in circumferential directions and with portions of outer surfaces remote from the unit intake opening 2a having a shape swelling on opposite sides to the impellers are formed on peripheries of the scroll intake openings 34a-34d of the scroll casings 32a-32d.