Indoor unit and air conditioner

The invention relates to the technical field of air conditioners, and discloses an indoor unit which comprises a machine shell, a heat exchanger and a heat exchanger. The heat exchange assembly is arranged in the machine shell, and the heat exchange assembly is located at the air outlet or the air inlet; the fan assembly is arranged in the machine shell; the air duct assembly is arranged in the machine shell and comprises an air duct side wall; the side wall of the air duct is provided with two adjacent curved surfaces; the fan assembly and the air outlet are both located on the same side of the two curved surfaces, and the air outlet direction of the fan assembly faces the side wall of the air duct, so that outlet air of the fan assembly circulates towards the air outlet along the two curved surfaces. When the fan assembly blows air towards the side wall of the air duct, air circulates towards the air outlet along the two curved surfaces, at the moment, noise generated by air wake flow at the tail end of the