Provision of new butyric acid-producing bacteria. Thaw a frozen stock solution of the strain (a solution in which cells are suspended in 10% (w / v) skim milk-2% sodium glutamate solution) (bacterial count: 2.0 to 5.5 × 10 10 cells / mL), A portion of 1% inoculated into 4 mL of PY liquid medium (PYGA medium) supplemented with 33 mM sodium acetate and 0.5 (w / v)% glucose, anaerobically cultured at 37 ° C. for 24 hours, and then cultured in PYGA medium After inoculating 1% of the solution and anaerobically culturing at 37 ° C. for 24 hours, a part of the culture was inoculated into PY medium containing 33 mM sodium acetate and 0.5 (w / v)% L-sorbose at 1%. Then, after anaerobic culture at 37 ° C. for 24 hours, the amount of butyric acid produced when measuring the butyric acid concentration in the culture solution is YIT 100, which is a reference strain of Anaerotipes hadrus (Eubacterium hadrum) Compared with 92T (DSM3119T), it is 1.5 times or more. A butyric acid-producing bacterium belonging to hadrus.新たな酪酸産生菌の提供。 菌株の凍結保存液（菌体を１０％（ｗ／ｖ）スキムミルク－２％グルタミン酸ナトリウム溶液に懸濁した溶液）（菌数：２．０～５．５×１０10ｃｅｌｌｓ／ｍＬ）を融解し、その一部を３３ｍＭの酢酸ナトリウム及び０．５（ｗ／ｖ）％のグルコースを添加したＰＹ液体培地（ＰＹＧＡ培地）４ｍＬに１％接種し、３７℃で２４時間嫌気培養した後、ＰＹＧＡ培地に培養液を１％接種し、３７℃で２４時間嫌気培養した後、培養液の一部を、３３ｍＭの酢酸ナトリウム及び０．５（ｗ／ｖ）％のＬ－ソルボースを含むＰＹ培地に１％接種し、３７℃で２４時間嫌気培養した後、培養液中の酪酸濃度を測定する際の酪酸産生量が、Ａｎａｅｒｏｓｔｉｐｅｓ ｈａｄｒｕｓ（Ｅｕｂａｃｔｅｒｉｕｍ ｈａｄｒｕｍ）の基準株であるＹＩＴ １００９２T（ＤＳＭ３１１９T）と比較して、１．５倍以上であるＡ．ｈａｄｒｕｓに属する酪酸産生菌。
