Indoor unit for an air-conditioning apparatus

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

• a rear casing for mounting a heat exchanger and an air-sending fan on a front side of the rear casing;
• and
• a front casing for surrounding the heat exchanger and the air-sending fan on the front side of the rear casing,
• wherein the rear casing has an upper wall, which is formed at an upper portion of the rear casing and protrudes frontward,
• wherein the front casing has an overlap portion, which is formed at an upper portion of the front casing and protrudes rearward to be overlapped by the upper wall,
• wherein the upper wall of the rear casing has a fixing claw, which protrudes downward from a lower surface of the upper wall,
• wherein the front casing has a claw receiver for locking the fixing claw from a lower side of the fixing claw,
• wherein the upper wall has a front portion on a front side with respect to the fixing claw,
• wherein the claw receiver protrudes rearward from the overlap portion,
• wherein the overlap portion has a recessed portion, which is entirely surrounded by the overlap portion and opened upward on a front side of the claw receiver, and
• wherein the overlap portion has a side provided between the recessed portion and the claw receiver.