Indoor unit of air conditioner

The utility model relates to the technical field of air conditioners, and discloses an indoor unit of an air conditioner, which comprises a volute, the front side of the volute is provided with an accommodating groove, and the rear side of the volute is provided with a hollow part communicated with the accommodating groove; the fan is arranged in the accommodating groove; the sound absorption assembly is arranged on the rear side of the volute and comprises a front side plate and a rear side plate, the front side plate shields the hollow part, the rear side plate is arranged on the rear side of the front side plate, and a cavity is defined between the rear side plate and the front side plate; a plurality of through holes communicated to the cavity are formed in the front side plate, and a sound absorption layer is arranged in the cavity. Due to the fact that the penetrating holes of the front side plate are thin and dense, the acoustic resistance is large, the sound quality is small, the ratio of the acoustic