It is intended to provide a novel method for manufacturing a 6-substituted 1-methyl-1H-benzimidazole derivative and an intermediate of said methods. [Solution] A method for manufacturing a 6-substituted 1-methyl-1H-benzimidazole derivative represented by the following general formula (IV) [wherein R 3 represents a hydrogen atom or a C 1 -C 4 alkyl group], comprising manufacturing a 4-substituted N 2 -methylbenzene-1,2-diamine derivative from a particular 5-substituted N-methyl-2-nitroaniline derivative, subsequently reacting the resulting compound with {4-[(2,4-dioxo-1,3-thiazolidin-5-yl)methyl]phenoxy}acetic acid or an acid chloride or a mixed acid anhydride thereof, and subsequently subjecting the resulting compound to intramolecular dehydration condensation.

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