INVENTORY MANAGEMENT DEVICE, INVENTORY MANAGEMENT METHOD, AND INVENTORY MANAGEMENT SYSTEM

To provide an inventory management device, an inventory management method, and an inventory management system capable of improving accuracy of an article inventory management.SOLUTION: An inventory management device 7 is provided inside a refrigerator 3 and outside the refrigerator 3 respectively, and comprises a first antenna 71 and a second antenna 72 to communicate with an RFID tag 6 attached to an article W, and a controller 74, where the controller receives a first electric wave from the RFID tag 6 and a second electric wave from a communication tag via the first antenna 71 and the second antenna 72 respectively, and determines carrying in/out the article W based on time series variation of a magnitude relation between the intensity of the first electric wave P1 and of the second electric wave P2 by performing the communication with the RFID tag 6 which is attached to the article W passing through the first gate 31 and the second gate 32, using the first antenna 71 and the second antenna 72.SELECTED DRAWING: Figure 1 【課題】物品の在庫管理の精度が向上する在庫管理装置、在庫管理方法及び在庫管理システムを提供する。【解決手段】在庫管理装置７は、冷蔵庫３の内部及び冷蔵庫３の外部にそれぞれ設けられ、物品Ｗに付されたＲＦＩＤタグ６と通信するための第１アンテナ７１及び第２アンテナ７２と、第１ゲート３１又は第２ゲート３２を通過する物品Ｗに付されたＲＦＩＤタグ６との通信を第１アンテナ７１及び第２アンテナ７２により行うことで、ＲＦＩＤタグ６からの第１電波及び通信タグからの第２電波をそれぞれ第１アンテナ７１及び第２アンテナ７２を介して受信し、第１電波Ｐ１の強度と第２電波Ｐ２の強度との大小関係の時系列変化に基づいて物品Ｗの搬出搬入を判定するコントローラ７４と、を備える。【選択図】図１