A RFID tag includes an inlet in which an antenna for communication and a circuit chip performing radio communication with the antenna are electrically connected to each other. The RFID tag further includes a thermal storage section which encloses the inlet, which is made of a nonmetal, and which prevents thermal diffusion into the inlet and a thermal insulating section which encloses the thermal storage section, which prevents thermal conduction to the thermal storage section, and which has higher thermal diffusivity than thermal diffusivity of the thermal storage section and lower thermal conductivity than thermal conductivity of the thermal storage section.