An indoor heat exchanger comprising: a first fin unit having a plurality of fins arranged side by side; a second fin unit having a plurality of fins arranged side by side and obliquely arranged and having an upper end of the second fin unit that comes in the close proximity to an upper end of the first fin unit; a first seal material that seals a gap between the upper end of the first fin unit and the upper end of the second fin unit; and a plurality of heat transfer tubes that are arranged to penetrate through the fins of the first fin unit and the fins of the second fin unit, wherein the heat transfer tubes comprise: an inlet heat transfer tube that is connected to inlet piping of refrigerant that circulates through a refrigerating cycle when the refrigerating cycle is a heating operation cycle; and a plurality of relay heat transfer tubes, at least one of which is arranged nearer the first seal material than the inlet heat transfer tube is, and, through which the refrigerant that is flowed out from the inlet heat transfer tube flows one after another, and the plurality of relay heat transfer tubes is disposed between the inlet heat transfer tube and the first seal material, characterized in that the indoor heat exchanger further comprises: a second seal material that seals a gap between a lower end of the first fin unit and an indoor machine chassis that houses the first fin unit, wherein at least one of the relay heat transfer tubes is arranged nearer the second seal material than the inlet heat transfer tube is, and wherein the relay heat transfer tubes are disposed between the inlet heat transfer tube and the second seal material. a first fin unit having a plurality of fins arranged side by side; a second fin unit having a plurality of fins arranged side by side and obliquely arranged and having an upper end of the second fin unit that comes in the close proximity to an upper end of the first fin unit; a first seal material that seals a gap between the upper end of the first fin unit and the upper end of the second fin unit; and a plurality of heat transfer tubes that are arranged to penetrate through the fins of the first fin unit and the fins of the second fin unit, wherein the heat transfer tubes comprise: an inlet heat transfer tube that is connected to inlet piping of refrigerant that circulates through a refrigerating cycle when the refrigerating cycle is a heating operation cycle; and a plurality of relay heat transfer tubes, at least one of which is arranged nearer the first seal material than the inlet heat transfer tube is, and, through which the refrigerant that is flowed out from the inlet heat transfer tube flows one after another, and an inlet heat transfer tube that is connected to inlet piping of refrigerant that circulates through a refrigerating cycle when the refrigerating cycle is a heating operation cycle; and a plurality of relay heat transfer tubes, at least one of which is arranged nearer the first seal material than the inlet heat transfer tube is, and, through which the refrigerant that is flowed out from the inlet heat transfer tube flows one after another, and the plurality of relay heat transfer tubes is disposed between the inlet heat transfer tube and the first seal material, characterized in that the indoor heat exchanger further comprises: a second seal material that seals a gap between a lower end of the first fin unit and an indoor machine chassis that houses the first fin unit, wherein at least one of the relay heat transfer tubes is arranged nearer the second seal material than the inlet heat transfer tube is, and wherein the relay heat transfer tubes are disposed between the inlet heat transfer tube and the second seal material. a second seal material that seals a gap between a lower end of the first fin unit and an indoor machine chassis that houses the first fin unit, wherein at least one of the relay heat transfer tubes is arranged nearer the second seal material than the inlet heat transfer tube is, and wherein the relay heat transfer tubes are disposed between the inlet heat transfer tube and the second seal material.