A myocardial excitement complementation / visualization device capable of visualizing the myocardial excitement state in real time and a myocardial excitement detection device capable of improving the accuracy of detecting the excitement position of the myocardium are provided. An acquisition unit (2) for acquiring an intracardiac electrogram recorded by a plurality of electrodes, a calculation unit (3) for performing an operation for complementing and visualizing the excitability of the myocardium based on the intracardiac electrogram, A display unit (4) for displaying an excitement state, and the calculation unit (3) includes a first generation unit (11) for generating an action potential waveform for each of a plurality of intracardiac electrocardiograms, and an action potential waveform A correction unit (13) that corrects the amplitude of each unit waveform included, a second generation unit (14) that generates a shift waveform having a time phase different from each corrected action potential waveform, and each activity after correction A third generation unit (16) for creating a phase diagram based on the potential waveform and each shift waveform, and generating visualization data representing the excited state of the subject's myocardium based on each phase diagram； The unit (4) displays the change in the excitability of the subject's myocardium based on the visualization data心筋の興奮状態をリアルタイムで可視化することが可能な心筋興奮補完・可視化装置、及び心筋の興奮位置を検出する精度を高めることが可能な心筋興奮検出装置を提供する。 複数の電極で記録された心内心電図を取得する取得部（２）と、心内心電図に基づいて心筋の興奮状態を補完し、可視化するための演算を行う演算部（３）と、心筋の興奮状態を表示する表示部（４）とを備え、演算部（３）は、複数の心内心電図の各々に対して活動電位波形を生成する第一生成部（１１）と、活動電位波形に含まれる各単位波形の振幅を揃える補正を行う補正部（１３）と、補正された各活動電位波形と時相が異なるシフト波形を生成する第二生成部（１４）と、補正後の各活動電位波形と各シフト波形とに基づいて相図を作成し、各相図に基づいて被検者の心筋の興奮状態を表す可視化データを生成する第三生成部（１６）とを有し、表示部（４）は、可視化データに基づいて被検者の心筋の興奮状態の変化を表示する。
