To provide a container-packed coffee beverage improved in rich flavor and suppressed in unpleasant taste and to provide a method for improving a quality of taste of a container-packed coffee beverage.SOLUTION: The container-packed coffee beverage includes dead bacteria of at least one of lactic acid bacteria and bifidobacteria. When the total sum of the number of dead bacteria of lactic acid bacteria and dead bacteria of bifidobacteria included in 100 mL of coffee beverage is A (the number of pieces) and the content of soluble coffee solid included in 100 mL of coffee beverage is B, a ratio of A/B is preferably 1×10to 5×10.SELECTED DRAWING: None【課題】コクが向上しつつ雑味が抑制された容器詰めコーヒー飲料及び容器詰めコーヒー飲料の味質改善方法を提供すること。【解決手段】本発明に係る容器詰めコーヒー飲料は、乳酸菌及びビフィズス菌の少なくとも一方の死菌を含む。コーヒー飲料１００ｍＬ中に含まれる前記乳酸菌の死菌及び前記ビフィズス菌の死菌の個数の合計をＡ（個）、コーヒー飲料１００ｍＬ中に含まれる可溶性コーヒー固形分の含有量をＢ（ｇ）としたとき、Ａ／Ｂが１×１０５～５×１０１１であることが好ましい。【選択図】なし
