PROBLEM TO BE SOLVED: To provide a bitter taste inhibitor, and food and pharmaceutical compositions containing the same, and a kit for inhibiting bitter taste and a method for inhibiting bitter taste of food/drink or pharmaceutical by adding a bitter taste inhibitor to food/drink or pharmaceutical.SOLUTION: Provided are: a bitter taste inhibitor containing (E,E)2,4-heptadienal, and food and pharmaceutical compositions containing the bitter taste inhibitor by 0.001 to 2000 ppb a kit for inhibiting bitter taste of an oral pharmaceutical comprising the oral pharmaceutical and said bitter taste inhibitor and a method for inhibiting bitter taste of food/drink, or pharmaceutical by adding said bitter taste inhibitor to food/drink, or oral pharmaceutical.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】苦味抑制剤、及びそれを含む食品組成物、医薬組成物、及び苦味抑制用キット及び苦味抑制剤を飲食物又は医薬に添加する飲食物又は医薬の苦味抑制方法の提供。【解決手段】(E,E)2,4-ヘプタジエナールを含む苦味抑制剤、該苦味抑制剤を0.001~2000ppb含む食品組成物及び医薬組成物。経口医薬と該苦味抑制剤とを含む、前記経口医薬の苦味抑制用キット。該苦味抑制剤を飲食物又は経口医薬に添加する、飲食物又は医薬の苦味抑制方法。【選択図】なし