To solve the problem of a conventional ice water cooler such as that it is operated continuously for twenty four hours since it requires a large quantity of ice to quickly cool hot food material being cooked by heating, consequently it is making ice while being operated at night too, so the touch panel of a controller is kept illuminated brightly by pack light.

This cooler is so arranged as to put out a back light during ice accumulation. Moreover, in case that the finger of a person does not touch a touch panel within a set time, this puts out the back light and if the finger of a person touches the tough panel, it puts on the back light. Furthermore, if a human body detector detects the human body, it lights up the back light, and unless the detector detects the human body, it puts out the back light.