PURPOSE: To obtain the subject synergistic microbicidal composition having activities more than a well-known microbicidal composition, and capable of overcoming disadvantageous points concerning toxicity, a cost and compatibility of the conventional composition. CONSTITUTION: This synergistic microbicidal composition comprises 1- methyl-3,5,7-triaza-1-azoniatricyclo(3.3.1.1)decane chloride and a 3-isothiazolone compound selected from a group consisting of 2-n-octyl-3-isothiazolone, 5- chloro-2-methyl-3-isothiazolone, 2-methyl-3-isothiazolone and a mixture of two or more therof, and the weight ratio therof is within the range of about (1:2) to about (1:18,000).
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