A muscle electrostimulation device includes: a main body having a contact surface fitted around a portion fitted with the device of a lower limb or an upper limb. The contact surface extends in an X direction encircling the portion fitted with the device and in a Y direction perpendicular to the X direction. The main body is provided with a pair of electrodes arranged at a distance in the Y direction. Each of the pair of electrodes 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 along a direction of extension of a muscle fiber in the portion fitted with the device.
