Abstract: Disclosed is a heat exchanger for an indoor unit of an air conditioner being easier to make and having an improved efficiency of heat exchange by enlarging an area of the heat exchanger, which makes contact with air in a room. The heat exchanger for the indoor unit of the air conditioner comprises a first fin assembly for absorbing a heat from air in a room, a second fin assembly which is adjacent to an upper portion of the first fin assembly and spaced by a predetermined distance with respect to the first fin assembly, for absorbing a heat from air in the room, a plurality of refrigerant pipes which extend through the first fin assembly and the second fin assembly, for supplying a pathway for refrigerant, and a connecting member for connecting the first fin assembly and the second fin assembly with each other so that the second fin assembly is secured to the first fin assembly.