PROBLEM TO BE SOLVED: To provide a proximity detection system and a proximity detection method capable of preventing a second part such as a hand from touching a first part such as a treatment part or a treatment part. An approach detection system 1 of the present disclosure includes a sensor unit having an electrode 11 that can be fixed to a first part b1 of a body, an electrode 11 and a second part b2 of the body different from the first part b1. Is measured, and it is determined whether or not the measuring unit that converts the measured value into the positional relationship between the electrode 11 and the second portion b2 and the positional relationship received from this measuring unit are normal. The determination unit includes a determination unit and a notification unit that notifies the determination result of the determination unit. [Selection diagram] Fig. 9A【課題】手などの第２部位が治療部位や処置部位などの第１部に触れるのを未然に防止することが可能な接近検知システム、および接近検知方法の提供を目的とする。【解決手段】本開示の接近検知システム１は、身体の第１部位ｂ１に固定可能な電極１１を有するセンサ部と、電極１１と、第１部位ｂ１と異なる身体の第２部位ｂ２との間に生じる静電容量を計測し、この計測値を電極１１と第２部位ｂ２との位置関係に変換する計測部と、この計測部から受信した位置関係が、正常であるか否かを判定する判定部と、この判定部による判定結果を報知する報知部と、を備えている。【選択図】図９Ａ
