Compared with conventional tablets, the carbon dioxide foaming preparation to be put in a microbubble generator is from the time when the tablets start to dissolve chlorine contained in tap water in the microbubble generator until the tablet is completely dissolved. It is realized that the tablet maintains the ability to be completely neutralized and removed, and is provided as a carbon dioxide microbubble production method and a production device using the tablet. SOLUTION: The carbonated bath agent has a tablet diameter and tablet thickness of 7 mm or more, a tablet hardness of 15 kg or more, a tablet friability of 10 wt% or less, and a pH immediately after dissolving the tablet in hot water from 5.5 to 9. A method for producing carbon dioxide microbubble mixed water, which is a tablet which is 0 and the carbonated bath contains at least one of the following excipients and at least one of the following chlorine neutralizing compounds.【課題】マイクロバブル発生装置に入れる炭酸ガス発泡製剤が従来の錠剤に比べて、水道水に含まれている塩素を錠剤がマイクロバブル発生装置内で溶解し始める時点から錠剤が溶解終了する時点まで、完全に中和除去できる能力を維持する錠剤であることを実現し、その錠剤を使用した炭酸ガスマイクロバブル製造方法及び製造器として提供する。【解決手段】 炭酸入浴剤は、錠剤直径及び錠剤厚みがそれぞれ７ｍｍ以上、錠剤硬度が１５ｋｇ以上、錠剤摩損度が１０ｗｔ％以下、該錠剤を湯水に溶かした直後のｐＨが５．５から９．０である錠剤であり、かつ前記炭酸入浴剤は、下記賦形剤の少なくとも１つと、下記塩素中和化合物の少なくとも１つを含有する炭酸ガスマイクロバブル混合水の製造方法。
