PROBLEM TO BE SOLVED: To provide a container-packed beverage having a negative redox potential to be sustained for prevention of oxidation, with improved taste and flavor.SOLUTION: An apparatus for manufacturing a reduction beverage includes an insulation container 3 made of electrical insulator having a low electric conductivity which is accommodated in an outer container 2 having an internal space for accommodation, and quartz diorite porphyrite slurry 5 having a negative redox potential or water having a redox potential reduced to negative which is accommodated in a space 4 having a predetermined capacity formed between the internal surface of the outer container 2 and the external surface of the insulation container 3. A beverage (a beverage D to be processed) is accommodated in the insulation container 3 for a predetermined time, so that a reduction beverage R having a redox potential reduced to negative is accommodated in a closed container.【課題】酸化還元電位が負である状態が持続して、酸化を防止でき、飲料の味や風味を向上させることができること【解決手段】内部に収容できる空間を形成した外部容器２内に電気電導率の良くない絶縁物からなる絶縁体容器３を収容し、かつ、外部容器２の内面と絶縁体容器３の外面との間に形成した所定容量の空間４内に酸化還元電位が負である石英閃緑ひん岩スラリー５または酸化還元電位が負に下降した水を収容してなる還元飲料製造装置の絶縁体容器３内に、飲料（被処理飲料Ｄ）を所定時間収容することによって、酸化還元電位を負に下降させた還元飲料Ｒを密閉容器に収容する。【選択図】図１
