PROBLEM TO BE SOLVED: To provide a myocardial excitation determination device capable of supporting determination of a myocardial excitation dynamic phase during atrial fibrillation.SOLUTION: The device comprises: an acquisition part 2 which acquires a subject's inner electrocardiogram recorded by a recording unit A having plural electrodes; a calculation part 3 which performs calculation for generating visualized data expressing a myocardial excitation state on the basis of the inner electrocardiogram; and a determination part 4 which determines the type of the myocardial excitation dynamic phase on the basis of the visualized data.SELECTED DRAWING: Figure 1【課題】心房細動中の心筋の興奮動態の判別を支援することが可能な、心筋興奮判別装置を提供する。【解決手段】複数の電極を有する記録ユニットAにより記録された被検者の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、心筋の興奮状態を表す可視化データを生成するための演算を行う演算部3と、可視化データに基づいて心筋の興奮動態の種別を判別する判別部4とを備える。【選択図】図1