To provide an indoor unit for an air conditioner wherein an air flow of an indoor space is in a comfortable state.

In the indoor unit for the air conditioner, an air curtain air blow out opening blowing out air downward and forming an air curtain is provided in parallel with a longitudinal direction of an indoor unit body in a lower part of the indoor unit body, and an indoor air suction opening is provided more to a back face side of the indoor unit body than the air curtain air blow out opening.