The present invention improves the shape and material of an anal sphincter electromyography device so that a patient is able to maintain a comfortable posture which stretches legs even in a status of lying on bed during a surgery. For the forementioned, the provided anal sphincter electromyography device includes: a body part of a cylindrical shape which has an electrode measuring the electromyography of an anal sphincter on the outer circumference side by being inserted into an anal and has a conducting wire which has an end connected to the electrode and the other end connected to the outside; a head part of a globular shape or a shape which is similar with the globular shape which has a larger diameter than the diameter of the body part which is formed in one end of the body part; and a stopping part which is formed in a larger size than the diameter of the body part in the other end in which the head part of the body part is not positioned.;COPYRIGHT KIPO 2014
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