A muscle electrostimulation device (10) includes: a main body (20) having a contact surface (10b) fitted around a portion fitted with the device (10) of a lower limb (6) or an upper limb. The contact surface (10b) extends in an X direction encircling the portion fitted with the device (10) and in a Y direction perpendicular to the X direction. The main body (20) is provided with a pair of electrodes (32) arranged at a distance in the Y direction. Each of the pair of electrodes (32) is shaped in a band in which an extent in the X direction is larger than an extent in the Y direction and is arranged to cause an electric current to flow in the portion fitted with the device (10) along a direction of extension of a muscle fiber in the portion fitted with the device (10).提供一種能夠有效率地對肌肉提供電性刺激之肌肉電性刺激裝置。在肌肉電性刺激裝置10中具備：本體部20，係具有沿著下肢或上肢之被裝戴部的周圍所裝戴的裝戴面10b。裝戴面10b係於圍繞被裝戴部的X方向以及與X方向正交的Y方向延伸。於本體部20設置有於Y方向分離所配置的一對電極32。一對電極32之各個電極為X方向之範圍比Y方向之範圍還大的帶狀，且以使電流沿著被裝戴部之肌纖維的延伸方向流動至該被裝戴部的方式所配置。
