Abstract: An actuator handpiece for a neuromuscular stimulation device is described, said handpiece comprising: a head intended to come into contact with a body surface of a patient to be treated with a predetermined application frequency, said head being mounted on one end of a sliding rod having an opposite end provided with a magnet; a coil and an electronic board connected electrically to the coil and designed to generate a magnetic field for the alternating displacement of the magnet and therefore the head between a distal position, in which the head is intended to exert pressure on the body surface, and a proximal pressure-reducing or release position. A Teflon support structure of the coil is housed above a perforated steel plate situated in a plane defined inside a body of the actuator handpiece, the perforated plate being situated around a cylindrical wall of the support structure which, internally, defines a sliding seat for the magnet.