The present invention relates to an electrostimulation device and an electrostimulation method for abdominal muscles by applying breathing rhythms. The electrostimulation device comprises: a main body including an electrostimulation generating unit for generating electrostimulation; a power supply unit accommodated in the main body and supplying power; an electrode receiving the supply of power from the power supply unit and applying the electrostimulation to abdominal muscles of a wearer; a connecting unit transmitting the electrostimulation generated from the electrostimulation generating unit to the electrode; a tension sensor detecting relaxation (an inhalation section) and contraction (an exhalation section) of the abdominal muscles of the wearer; a signal control unit automatically regulating the electrostimulation of the electrostimulation generating unit to be on or off according to a signal detected by the tension sensor; a sheet-shaped basic material mounted with the electrode in order to apply the electrostimulation to the abdominal muscles of the wearer; a belt extended towards the side surface of the basic material in order to be worn on the waist part of the wearer; and a belt coupling unit coupling the belt. Therefore, the electrostimulation device can measure breathing rhythms through a tension sensor for detecting relaxation (an inhalation section) and contraction (an exhalation section) of the abdominal muscles of a wearer, can regulate injection timing of electrostimulation, and can further effectively facilitate contraction and exercise of the abdominal muscles.본 발명은 호흡리듬을 적용한 복부근육 전기자극 장치 및 전기자극 방법에 관한 것으로, 전기자극을 발생시키는 전기자극 발생부를 포함하는 본체와, 상기 본체에 수납되어 전원을 공급하는 전원공급부와, 상기 전원공급부로부터 전력이 공급되어 착용자의 복부근육에 전기자극을 가하는 전극과, 상기 전기자극 발생부에서 발생하는 전기자극을 상기 전극에 전달하기 위한 연결부와, 착용자의 복부근육이 이완(흡기구간)되고 수축(호기구간)되는 것을 감지하기 위한 장력센서와, 상기 장력센서에서 감지하는 신호에 따라 상기 전기자극 발생부의 전기자극을 자동적으로 on/off 하도록 조절하는 신호제어부와, 상기 전극을 장착하여 착용자의 복부근육에 전기자극을 주기 위한 시트 형태의 기재와, 상기 기재의 측면방향으로 연장되어 착용