A muscle electrical stimulation device is provided with a main body (10), a power source part (20) accommodated in the main body (10), an electrode part (30) to which electric power is supplied from the power source part (20), a control part (40) for controlling the supplying of electric power to the electrode part (30), and an operating part (50) for changing a control mode of the control part (40). The electrode part (30) is provided with a first electrode group (31) and a second electrode group (32). The first electrode group (31) extends from the main body (10) so as to be positioned on a right-hand side (X1) of a person (2) relative to a center line (10a) of the main body (10). The second electrode group (32) extends from the main body (10) so as to be positioned on a left-hand side (X2) of the person (2) relative to the center line (10a) when the device is attached to an abdominal region (3). The present invention is configured so that electricity can be conducted between the first electrode group (31) and the second electrode group (32) via the person (2), and the first electrode group (31) and the second electrode group (32) combined include four or more electrodes.
