PURPOSE: To confirm an ambient temperature at a present site simultaneously with a set temperature by outputting the temperature of the site to an indicator by control means, indicating the set temperature by ambient temperature setting means, and indicating them in a flashing manner by the time counter of the control means.

CONSTITUTION: A set temperature set by ambient temperature setting means 11 is input to indicating means 14, the ambient temperature of a present time is input to the means 14, and output to an indicator 15 by the means 14. The present ambient temperature detected by ambient temperature detecting means 12 is indicated on the indicator 14 in a 1 sec flashing manner by a 1 sec timer counter 16 contained in control means 13, and, as the present ambient temperature approaches the set temperature by the operation of an air conditioner, a LED lamp of the set temperature in the indicator 14, 0.5 sec flashes when the initial ambient temperature becomes the same as the set temperature. Thus, the initial ambient temperature can be confirmed, and a simple using mistake when the conditioner is used and a complexity can be eliminated.