A reader writer (communication device) executes at least one of reading identification information stored in an IC tag and writing the identification information to the IC tag. The reader writer includes: a wireless control circuit that generates output for communication; a temperature sensor (temperature detector) that detects a temperature in an environment in which an RFID chip, balun, filter circuit, power amplifier, and coupler (elements for forming the wireless control circuit) are used; a temperature judging unit that judges whether or not the environment in which the element is used falls within a usable temperature range of the element based on the temperature detected by the temperature sensor; and a wireless power supply controller that suppresses a supply of power to the wireless control circuit when the temperature judging unit judges that the element is not in the environment within the usable temperature range.