PROBLEM TO BE SOLVED: To prevent the living body of a user from affecting a health damage caused by electric wave generated from an intraoral cavity mounted instrument equipped with a wireless IC tag.SOLUTION: The system is based on a knowledge that when a user mounts the intraoral cavity mounting instrument in the oral cavity, by cutting off a transmitting circuit of the electric wave, the health damage of the user when the user mounts the intraoral cavity mounting instrument in the oral cavity, can be prevented. Particularly, the intraoral cavity mounting instrument equipped with the wireless IC tag is such an intraoral cavity mounting instrument with the wireless IC tag that includes a circuit on-off means for cutting off the circuit when the intraoral cavity mounting instrument is mounted in the oral cavity, and connecting the circuit when the intraoral cavity mounting instrument is taken away from the oral cavity.COPYRIGHT: (C)2013,JPO&INPIT【課題】無線用ICタグを備える口腔内装着器具から発生される電波が、使用者の生体に対して及ぼす健康被害を防止する。【解決手段】使用者が口腔内に口腔内装着器具を装着しているときには電波の発信回路を切断することにより、口腔内装着器具の装着時における使用者の健康被害を防止するという知見に基づく。具体的に、無線用ICタグを備える口腔内装着器具は、口腔内装着器具が口腔内に装着されたときに回路を切断し、口腔内装着器具が口腔内から外されたときに回路を接続する回路開閉手段を含む無線用ICタグを有する口腔内装着器具である。【選択図】図1