PROBLEM TO BE SOLVED: To provide a probe for measuring a cardiac action potential and a method of measuring the cardiac action potential, for suppressing the generation of noise due to the motion of the heart.SOLUTION: The probe for measuring the cardiac action potential includes a flexible covered conductor having a conductor and a coating film for covering the conductor and an insertion electrode to be inserted to the cardiac muscles. The insertion electrode is fixed to the distal end of the covered conductor, and is electrically connected to the conductor.COPYRIGHT: (C)2011,JPO&INPIT【課題】心臓の運動に起因するノイズの発生を抑制する、心筋活動電位測定用プローブ及び心筋活動電位の測定方法を提供すること。【解決手段】導線と、前記導線を被覆する被膜とを有する可撓性の被覆導線と、心筋に刺し入れられる刺入電極を有し、前記刺入電極が、前記被覆導線の先端に固定され、且つ前記導線に電気的に接続されていること。【選択図】図1