Indoor unit for air-conditioning apparatus

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

• a casing having an air inlet and an air outlet;
• an up-down airflow direction plate configured to be rotatably supported in the air outlet;
• and
• an auxiliary airflow direction plate configured to be rotatably supported at a position below the up-down airflow direction plate and on an upstream side of the up-down airflow direction plate,
• the up-down airflow direction plate having a main blade part formed of a flat plate, and a rear edge part formed of a flat plate and formed on an upstream side of the main blade part,
• when the main blade part is in a horizontal state, the rear edge part being inclined upward to a back face of the casing from the main blade part,
• when an angle α represents an angle formed between the main blade part and the rear edge part and an angle ε represents an angle formed between the main blade part and a virtual line passing through a center of a tip part of the auxiliary airflow direction plate, the angle ε being greater than the angle α.