To provide an indoor unit of an air conditioner preventing the easy losing of balance of a lifter suspended with two strings and, even if losing the balance, capable of quickly restoring to its original attitude.

This indoor unit 2 has a flat panel 4 having a rectangular vertical projection plane and suspended from a body 20 with a first suspension string 711 and a second suspension string 712. The first suspension string 711 suspends a first suspension point adjacent to a first side 401 of the flat panel 4, while the second suspension string 712 suspends a second suspension point adjacent to a second side 402, or the opposite side of the first side 401. The positions of the first suspension point and the second suspension pint are so set as preventing the orthogonal crossing of a two-point passing line F, which orthogonally crosses with a plumb line G passing the center of gravity of the flat panel 4 and passes through the first suspension point and the second suspension point, with the first side 401 and the second side 402.