PROBLEM TO BE SOLVED: To provide a nicorandil degradation inhibitor effective for suppressing degradation of nicorandil even in a dissolved state.SOLUTION: The nicorandil degradation inhibitor comprises a multivalent metal chloride. The multivalent metal chloride of the nicorandil degradation inhibitor is at least one compound selected from the group consisting of aluminum chloride, calcium chloride, magnesium chloride and zinc chloride.COPYRIGHT: (C)2011,JPO&INPIT【課題】ニコランジルの分解を、溶解状態であっても抑制することが可能な、ニコランジル分解抑制剤を提供すること。【解決手段】多価金属の塩化物からなる、ニコランジル分解抑制剤。【選択図】なし