To provide a radio operation system 20 capable of satisfactorily performing operation of a bathroom heating drying apparatus 1 from the outside and inside of a bathroom by use of one wireless remote control R while suppressing the cost.

At least two receivers 21 and 22 receiving infrared ray outputted from the wireless remote control R are prepared, one of them being provided within a lower cover 11 of a heating radiator 3 set in the ceiling part of the bathroom B, and the other in a dressing room D adjacent to the bathroom B. According to this, operation of the bathroom heating drying apparatus 1 by use of the one wireless remote control R can be satisfactorily performed regardless of the outside and inside of the bathroom.