An indoor unit for an air conditioning device that can increase the strength of a casing of the indoor unit, increase the stability of the indoor unit, and promote cooling of an electric component is disclosed. The indoor unit for the air conditioning device includes a casing formed with an intake air port in a lower portion thereof, and formed with an exhaust air port in an upper portion thereof, a fan arranged inside the casing, and generating air flow from the intake port to the exhaust port, a heat exchanging device arranged below the fan inside the casing to exchange heat with the air taken into the casing from the intake port, and an electric component case provided at a position adjacent to a lateral side of the fan in a circulation space of the air in the casing and configured as a strengthening member of the casing.