In this muscle electric stimulation device 10 which applies electric stimulation to a muscle, a sensor detects information pertaining to the body of a user. A control unit controls the voltage applied between electrodes and processes the information detected by the sensor. The sensor detects information for estimating the muscle amounts in each of a plurality of body regions to which electric stimulation is applied. The control unit estimates a muscle balance in the plurality of body regions on the basis of the detected information, and controls the voltage in accordance with the muscle balance.在給予肌肉電性刺激之肌肉電性刺激裝置10中，感測器係檢測與使用者的身體相關的資訊。控制部係控制對電極間施加的電壓，並且處理已以感測器檢測的資訊。感測器係檢測用以推定給予電性刺激的複數個身體部位之個別的肌肉量之資訊。控制部係基於檢測的資訊來推定複數個身體部位的肌肉均衡，且因應肌肉均衡來控制電壓。
