An indoor unit, provided for a ceiling, for an air conditioning device which selectively performs a cooling operation and a heating operation, the indoor unit comprising: an indoor fan; and an indoor heat exchanger which is disposed around the indoor fan and through which air carried by the indoor fan passes, wherein the indoor heat exchanger includes a plurality of fins and heat transfer tubes running through the fins, the indoor heat exchanger includes a plurality of tube lines (L1, L2, L3), the number of which is at least three and in which the heat transfer tubes are arranged side by side in a direction that intersects with an airflow direction, and the indoor heat exchanger has a first region and a second region, the first region including a first refrigerant path (81, 82, 83) which forms during the heating operation, a full counter flow portion in which a refrigerant flows sequentially from a tube line located most downstream in the airflow direction toward a tube line located most upstream in the airflow direction, and during the cooling operation, a full parallel flow portion in which the refrigerant flows sequentially from the tube line located most upstream in the airflow direction toward the tube line located most downstream in the airflow direction, the second region being configured so that air has a lower flow velocity in the second region than in the first region and including a second refrigerant path (84, 85) which forms, during both the cooling and heating operations, both a partial parallel flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located downstream of the particular tube line in the airflow direction, and a partial counter flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located upstream of the particular tube line in the airflow direction, characterized by a flow dividing portion (76, 77), formed by the second refrigerant path (84, 85), that is configured to divide the refrigerant flowed out of the partial parallel flow portion into a plurality of partial counter flow portions including the partial counter flow portion during the cooling operation. the first region including a first refrigerant path (81, 82, 83) which forms during the heating operation, a full counter flow portion in which a refrigerant flows sequentially from a tube line located most downstream in the airflow direction toward a tube line located most upstream in the airflow direction, and during the cooling operation, a full parallel flow portion in which the refrigerant flows sequentially from the tube line located most upstream in the airflow direction toward the tube line located most downstream in the airflow direction, during the heating operation, a full counter flow portion in which a refrigerant flows sequentially from a tube line located most downstream in the airflow direction toward a tube line located most upstream in the airflow direction, and during the cooling operation, a full parallel flow portion in which the refrigerant flows sequentially from the tube line located most upstream in the airflow direction toward the tube line located most downstream in the airflow direction, the second region being configured so that air has a lower flow velocity in the second region than in the first region and including a second refrigerant path (84, 85) which forms, during both the cooling and heating operations, both a partial parallel flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located downstream of the particular tube line in the airflow direction, and a partial counter flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located upstream of the particular tube line in the airflow direction, characterized by a partial parallel flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located downstream of the particular tube line in the airflow direction, and a partial counter flow portion in which the refrigerant flows from the heat transfer tube in any particular one of the plurality of tube lines (L1, L2, L3) toward another tube line located upstream of the particular tube line in the airflow direction, characterized by