Indoor unit

The utility model discloses an indoor unit which comprises an outer shell, an air inlet, an air outlet, a supporting plate, an air inlet, an air outlet, an air inlet, an air outlet, an air outlet and an air outlet, and the supporting plate is arranged in the outer shell and located between the air inlet and the air outlet. The fan is arranged in the shell and located on one side of the supporting plate; the heat exchanger comprises a refrigerant pipe, a plurality of fins and two pipe plates, the fins are arranged on the refrigerant pipe and located between the two pipe plates, the refrigerant pipe penetrates through the pipe plates, avoiding notches are formed in the opposite angles of the fins respectively, and the opposite angles of the pipe plates are arranged to be flat angles respectively; a mounting avoiding part is formed by the avoiding notch and the flat angle of the corresponding corner part; wherein the heat exchanger obliquely extends upwards from inside to outside, a mounting avoiding part at the