the present invention provides novel benzimidazole derivatives or salts thereof represented by the general formula , ## str1 ## wherein r 1 is a hydrogen atom or a halogen atom ; r 2 is a phenyl - lower alkyl group ; r 3 is a heterocyclic group selected from the group consisting of an indolyl group , indolinyl group , 1h - indazolyl group , 2 - quinolinonyl group , 3 , 4 - dihydro - 2 - quinolinonyl group and 1 , 4 - benzoxazinyl group ; a is a lower alkylene group ; n is 0 or 1 . the benzimidazole derivatives or salts of the present invention are effective agents for treating various arteriosclerotic diseases .