Abstract: Breakage of a glass panel is detected by a simple structure practically without disfiguring the glass panel. A glass panel breakage detection system (12) has a glass panel (10), a reading device (14), and a notification device (16). The glass panel (10) has plate glass (18) formed of reinforced glass, an antenna (22) provided on the surface of the plate glass (18), and an ID chip (24) connectedly attached to the antenna (22) and transmitting, by radio communications through the antenna (22), identification information as a reply to a request from the outside. The reading device (14) acquires the identification information from the ID chip (24) by radio communications through the antenna (22). When a trouble occurs in the acquisition of the identification information by the reading device (14), the notification device (16) notifies the fact to the request from the reading device (14) to the radio chip.