PURPOSE: To obtain preservation agent which acts effectively on true fungi and the like with active substance having good stability by including the mixture of specified triazole, disinfectant carbamate, and monoisobutyrate in specified quantity, and binding material, fastening material, diluent, water, emulsifying agent, and wetting agent.

CONSTITUTION: This agent contains 1-[[2-(2,4-dichloro phenyl-4-propyl-1,3- dioxolane-2-yl]methyl]-1H-1,2,4-triazole, 0.1-2.0 wt.%, disinfectant carbamate, namely, 3-iodine-2-propynyl-butyl carbamate or methyl-benzimidazole-2 yl- carbamate, 0.2-2.3 wt.%, 2,2,4-trimethyl-1,3-penta diol-monoisobutyrate, 1.0-5.0 wt.%. It further contains a mixture which consists of at least one kind of binding material and/or fastening material and/or at least one kind of diluent and water, as well as at least one kind of emulsifying agent and/or wetting agent as necessarily.