Myoelectric sensor

A myoelectric sensor for detecting myoelectric signals caused by a body movement comprising:

• an elastically expandable and contractible annular wearing band adapted to be worn on a limb and tightly surrounding therearound;
• a plurality of myoelectric detection units arranged in a circumferential direction of said wearing band apart from each other and each having a plurality of myoelectric detection electrodes which adapts to contact with a surface of the limb and to detect myoelectric signals from corresponding parts of the limb;
• and
• connecting cables which electrically connect said myoelectric detection units adjacent to each other and transmit the myoelectric signals therebetween,
• wherein each of said connecting cables has at least one bent portion whose bent shape changes in accordance with a change in distance between the myoelectric detection units adjacent to each other,
• wherein each of said plurality of myoelectric detection units comprises a central part and a terminal part each having at least one of the myoelectric detection electrodes, the central part of at least one of the plurality of myoelectric detection units mounting a circuit board with at least an amplifying circuit, and the terminal part being engaged with said central part movably forward and backward while being prevented from twisting with respect to said central part.