Electro-stimulator (1) includes electrode pad (60) that outputs current to provide electrical stimulation to a muscle, angular velocity sensor (51) that detects information on motion of a waist, and controller (30) that adjusts magnitude of the current output from electrode pad (60) based on a result of the detection by angular velocity sensor (51). Electro-stimulator (1) further includes belt (11) that supports electrode pad (60), angular velocity sensor (51), and controller (30). Thus, current flows through an abdomen, thereby providing electrical stimulation to the abdomen, and enabling proper training of abdominal muscles.