PROBLEM TO BE SOLVED: To provide a toxin production inhibitor inhibiting the toxin production by a microorganism without inhibiting the proliferation of the microorganism.SOLUTION: The toxin production inhibitor for the microorganism contains one or more compounds (A) selected from a compound represented by general formula (a1): R1-OH (a1) (wherein, R1 is 9-18C linear or branched alkyl or alkenyl) and a compound represented by general formula (a2): R2-O-(EO)n-H (a2) (wherein, R2 is 8-18C linear or branched alkyl or alkenyl EO is ethyleneoxy and n is an integer of 1-15).COPYRIGHT: (C)2013,JPO&INPIT【課題】微生物の増殖を妨げることなく毒素産生を抑制する毒素産生抑制剤の提供【解決手段】下記一般式(a1)で表される化合物及び一般式(a2)で表される化合物から選ばれる1種以上の化合物(A)を含有する、微生物の毒素産生抑制剤。R1-OH (a1)(式中、R1は炭素数9~18の直鎖又は分岐鎖のアルキル基又はアルケニル基を示す。)R2-O-(EO)n-H (a2)(式中、R2は炭素数8~18の直鎖又は分岐鎖のアルキル基又はアルケニル基を示し、EOはエチレンオキシ基を示し、nは1~15の整数を示す。)【選択図】なし