To provide a wireless detection type diaper capable of accurately notifying that a diaper is wet with urine or absorbing moisture, and preventing overheating of a chip of a leader and its monitoring equipment.A diaper main body including a water-permeable lining layer, a waterproof layer, an absorbent layer, and a frequency-shift type RFID tag including a chip and an antenna, wherein the antenna includes a main antenna and an extension When the antenna 222 is included and the stretching antenna 222 is disposed on the surface of the water-absorptive base material 23, when the stretching antenna 222 and the base material 23 are in contact with the absorbing layer and the diaper body 10 is not wet, the reading of the antenna 22 When the frequency band is deviated from the reading frequency band of the monitoring facility and the base material 23 gets wet, its dielectric constant changes and shifts the reading frequency band of the antenna 22 to the reading frequency band of the monitoring facility.BACKGROUND OF THE INVENTION【課題】おむつが尿で濡れたり、水分を吸収したことを正確に知らせることができ、リーダーのチップの過熱を防ぐ無線検知式おむつ及びそのモニタリング設備を提供すること。【解決手段】水を透過するライニング層11と、防水層と、吸収層を含むおむつ本体10と、チップ21とアンテナ22を含む周波数シフト型RFIDタグ20を備え、アンテナ22がメインアンテナ221と延伸アンテナ222を含み、延伸アンテナ222が吸水性のある基材23の表面に配設され、延伸アンテナ222と基材23が吸収層に接触し、おむつ本体10が濡れていない時、アンテナ22の読み取り周波数帯がモニタリング設備の読み取り周波数帯からずれており、基材23が濡れた時、その誘電率が変化し、アンテナ22の読み取り周波数帯をモニタリング設備の読み取り周波数帯にシフトさせる。【選択図】図1
