To provide a medicinal composition inhibiting the proliferation of mammalian animal tumor and cancer and capable of being used for the treatment of viral infectious diseases.

This used specific fungicidal medicine is a benzoimidazole derivative expressed by formula (I) [wherein, X is H, a halogen, a ≤7C alkyl or ≤7C alkoxy; (n) is ≤4 positive integer; Y is H, chlorine, nitro, methyl or ethyl; R is butylcarbamoyl and R2is NHCOOR1(wherein, R1is a ≤7C aliphatic hydrocarbon)], or its medicinally acceptable inorganic or organic acid adduct salt.

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