To provide an abnormal sound preventing structure for an air conditioner that does not generate abnormal sound without using a projection bringing a decorative panel into line contact with a frame body, or without applying adhesive tapes and a silicone-based lubricant.

The abnormal sound preventing structure for the air conditioner comprises a frame body made of a synthetic resin constituting the rear face of the air conditioner and a decorative panel body constituting the front face of the air conditioner. The characteristic of the structure is that surface roughness of a contact face between the mating part of the frame body and the mating part of the decorative panel is made small.