To provide a myocardial excitation complementation/visualization device capable of visualizing an excited condition of the cardiac muscle in real time, and myocardial excitation detection device capable of improving accuracy of detecting an excited position of the cardiac muscle.SOLUTION: The myocardial excitation complementation/visualization device comprises: an acquisition unit (2) for acquiring an intracardiac electrocardiogram recorded by a plurality of electrodes； a computing unit (3) compensating an excited state of the cardiac muscle on the basis of the intracardiac electrocardiogram and performing computation for visualization； and a display unit (4) for displaying the excited state of the cardiac muscle. The computing unit (3) includes a first generation section (11) for generating an action potential waveform for each of a plurality of intracardiac electrocardiograms, a compensation section (13) for compensating to match amplitudes of respective unit waveforms included in the action potential waveforms, a second generation section (14) for generating shift waveforms having different time phases from the compensated respective action potential waveforms, and a third generation section (16) for creating phase portraits on the basis of the respective compensated action potential waveforms and the respective shift waveforms and generating visualization data representing the excited state of the cardiac muscle of a subject on the basis of the respective phase portraits. The display section (4) displays changes in excited states of the cardiac muscle of the subject on the basis of the visualization data.SELECTED DRAWING: Figure 1【課題】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。【解決手段】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
