The present invention relates to a body-attached electromyogram sensor that detects signals from a muscle and provides the degree of contraction and relaxation of the muscle. More specifically, the present invention relates to a body-attached electromyogram sensor that is formed very thin so that the electromyogram sensor can be attached more naturally inside a socket physically connecting a robot leg of an amputee, and thus is more comfortable to wear. In addition, the body-attached electromyogram sensor is made of a material that is elastic and thus naturally expands and contracts according to the movement of the muscle, and is breathable and thus can effectively discharge secretions such as sweat. Accordingly, the body-attached electromyogram sensor can be worn repeatedly and attached for long periods of time.
