PROBLEM TO BE SOLVED: To provide a bitter taste inhibitor, effective for decreasing the bitterness in a bitter substance, which can be incorporated in foods and medicines.SOLUTION: The bitter taste inhibitor contains at least one as an active component selected from Myristica fragrans, Scopolia acutangula, Euphorbia lathyris LINN., Solanum lyratum, Sambucus williamsii, Eleutherococcus senticosus, Sesamum indicum, Morus alba, Caesalpinia sappan L., Monascus purpureus, Perilla frutescens var. crispa, Allium tuberosum Rottler ex Spreng, Ocimum basilicum, Draba nemorosa, Impatiens balsamina and their extracts.