Indoor unit air-conditioning apparatus

An indoor unit for an air-conditioning apparatus, the indoor unit comprising:

• a casing, a back surface of which is to be mounted to a wall surface in a room;
• an air inlet, which is formed in the casing;
• an air outlet, which is formed in the casing;
• an indoor heat exchanger and an indoor fan, which are arranged in an air passage, which is continuous from the air inlet to the air outlet;
• an up-and-down airflow direction louver, which is arranged in the air outlet, is able to rotate, and is configured to change a direction of blowing air in an up-and-down direction;
• and
• an up-and-down airflow direction auxiliary louver, which is configured to, at a position on a front surface side of the casing, change the direction of the blowing air in the up-and-down direction, wherein
• the up-and-down airflow direction louver includes
• an upstream guide surface, which is configured to guide a flow of the blowing air, and
• a downstream guide surface, which is arranged on a downstream side of the blowing air and below the upstream guide surface, and is configured to guide the blowing air, and
• a level difference between the upstream guide surface and the downstream guide surface,
• when the blowing air blows to the front of the casing, the up-and-down airflow direction louver is open in a downward direction of the air outlet and forms an air outlet passage of the blowing air, and the up-and-down airflow direction auxiliary louver is positioned in a frontward direction of the casing relative to the up-and-down airflow direction louver and forms the air outlet passage together with the up-and-down airflow direction louver,
• the up-and-down airflow direction auxiliary louver includes an upstream end portion, which is positioned on an upstream side of the air outlet passage,
• the upstream end portion is positioned above the downstream guide surface, upstream of an end portion of the downstream guide surface and downstream of the level difference,
• the level difference is a curved step, which has an upstream end that is continuous with the upstream guide surface and a downstream end that is continuous with the downstream guide surface,
• the downstream end of the level difference is upstream of the upstream end portion, and
• the upstream guide surface of the up-and-down airflow direction louver is coupled to a first rotation shaft so that the downstream guide surface is farther from the rotation shaft than the upstream guide surface,
• the up-and-down airflow direction auxiliary louver is coupled to and rotates about a second rotation shaft, and
• a distance between the upstream guide surface and the first rotation shaft is less than a distance between the upstream end portion and the second rotation shaft.