PROBLEM TO BE SOLVED: To provide an electrocardiograph capable of measuring an accurate electrocardiogram.SOLUTION: The electrocardiograph includes: a first electrode 11 for detecting a first induced potential generated between a subject and itself by contact with a skin of the subject； a capacitive coupling electrode-type second electrode 12 for detecting a second induced potential generated by close contact with the subject； a third electrode 13 coming into contact with the subject's skin； a measurement circuit 20 for measuring an electrocardiogram of the subject on the basis of a potential difference between the first induced potential and the second induced potential； and a feedback circuit 30 detecting an intermediate potential from the first induced potential and the second induced potential, invertingly amplifying the intermediate potential, and feeding it back to the third electrode 13.SELECTED DRAWING: Figure 2【課題】正確な心電の計測が可能な心電計測装置を提供する。【解決手段】被験者の皮膚との接触によって被験者との間で発生する第１誘導電位を検出する第１電極１１と、被験者との密着によって発生する第２誘導電位を検出する静電容量結合型の第２電極１２と、被験者の皮膚に接触する第３電極１３と、第１誘導電位と第２誘導電位との電位差に基づいて被験者の心電を計測する計測回路２０と、第１誘導電位及び第２誘導電位から中間電位を検出し当該中間電位を反転増幅して第３電極１３にフィードバックするフィードバック回路３０と、を備える。【選択図】図２
