PROBLEM TO BE SOLVED: To provide a body-motion determination device capable of detecting precisely whether a sensor mounted on a human body is normal or abnormal, and an electro-stimulator having the body-motion determination device.SOLUTION: A body-motion determination device comprises a first detection part SL and a second detection part SR having sensors SL1 and SL2, and SR1 and SR2, and a discrimination part for discriminating the motion state of the human body. The sensors SL1 and SL2, and SR1 and SR2 are mounted at positions symmetric with respect to a median plane O that is a plane as the center of the symmetric motions of the human body. The body-motion determination device 10 further comprises a sensor abnormality detection part for detecting whether the displacement sensors SL1 and SL2, and SR1 and SR2 are normal or abnormal.COPYRIGHT: (C)2014,JPO&INPIT【課題】人体に装着されたセンサであれ、その異常の有無を精度よく検知することのできる体動判定装置及び該体動判定装置を用いた電気刺激装置を提供する。【解決手段】体動判定装置は、センサSL1,SL2,SR1,SR2からなる第1検出部SL及び第2検出部SR、人体の動作状態を判別する判別部を備える。センサSL1,SL2,SR1,SR2は、人体の対称な動作の中心となる面である正中面Oに対称な位置に装着される。また、体動判定装置10は、変位センサSL1,SL2,SR1,SR2の異常の有無を検知するセンサ異常検知部を備える。【選択図】図1