This indoor unit comprises a fixed plate (9) that is formed on the top edge of a side wall of a drain pan (7) that collects drain water generated by an indoor heat exchanger (110), and an antibacterial agent accommodating case (11) that: accommodates an antibacterial agent (24); has a case frame (15) disposed in a portion where the drain water collects, a case mounting section (13) that corresponds to the fixed plate (9) and that is detachably mounted to the fixed plate (9), and an arm (12) that couples the case frame (15) and the case mounting section (13); and is mounted in an opening portion of an inlet that takes air into a main unit (1).
