Novel benzimidazoles having antithrombotic activity. Exemplary are: (a) 2-(4-amidinophenylaminomethyl)-1-methyl-5-[1-(ethoxycarbonylmethylamino)-1-(2,5-dihydropyrrolocarbonyl)-ethyl]-benzimidazole, (b) 2-[4-(N-phenylcarbonylamidino)-phenylaminomethyl]-1-methyl-5-[1-(ethoxycarbonylmethylamino)-1-(2,5-dihydropyrrolocarbonyl)-ethyl]-benzimidazole, and (c) (R)-2-[4-(N-phenylcarbonylamidino)-phenylaminomethyl]-1-methyl-5-[1-(isobutyloxycarbonylmethylamino)-1-(pyrrolidinocarbonyl)-ethyl]-benzimidazole.