A sound absorber includes a duct member constituting a resonance pathway, the duct member including a pathway portion communicating ends of the duct member; a base member including a concave portion; and a cover member including a neck in which to insert the duct member. According to the invention, the heating body is in formed from a heat-conducting synthetic material encapsulating a heating element. Meanwhile, the light emitter E keeps moving in the scan direction Ds, thereby irradiating even the terminating end of the application liquid with the light without fail. The processing unit is also used for controlling the reading of the information items contained in the RFID chip by the reader and for storing the read information items in the memory in such a way that the information items of the RFID chip are displayable on the display screen of the electronic label by the instruction of the processing unit.