Indoor unit of air conditioner

It is an object of the present invention to provide an indoor unit of an air conditioner including a front opening and closing panel with a structure wherein a sink is difficult to occur in a design surface. The indoor unit of the air conditioner according to the present invention, the indoor unit of the air conditioner being a wall-hung type indoor unit, including a main body having a front frame of a main body and a back frame of a main body, a front opening and closing panel 1 that is mounted on the front frame of the main body in a freely openable and closable manner, an arm 25 that is provided on a rear surface of the front opening and closing panel 1 and held in a freely rotating manner at the front frame of the main body, a lug 26 that is provided on the rear surface of the front opening and closing panel 1 and latched to the front frame of the main body with the front opening and closing panel 1 being in a closed state, a base, whereon the arm 25 or the lug 26 is disposed upright, that is provided on the rear surface of the front opening and closing panel 1 in a manner spaced apart from the front opening and closing panel, and a thin-walled leg that links the front opening and closing panel 1 with the base.