Novel imidazole derivatives of formula(I) inhibit effectively the action of angiotensin II and have a superior antihypertensive activity: ##STR1## wherein: A is a straight, branched or cyclic C.sub.1 -C.sub.6 alkyl group, or OR.sub.1 wherein R.sub.1 is a hydrogen, or a straight, branched or cyclic C.sub.1 -C.sub.6 alkyl radical; B is a halogen, CF.sub.3 or CF.sub.2 CF.sub.3 ; X is N or N-oxide; Y is --CH.sub.2 --, --CH(OR.sub.1)-- wherein R.sub.1 is the same as defined above, or --C(.dbd.O)--; n is 0 or an integer of 1 to 4; Z is a halogen, --OH, --OR.sub.1, --NR.sub.1 R.sub.2, --N(.dbd.O)R.sub.3 R.sub.4, --C(.dbd.O)R.sub.1, --C(.dbd.O)OR.sub.1, --CH(OR.sub.1).sub.2 or --C(.dbd.O)N.sub.1 N.sub.2 wherein R.sub.1 is the same as defined above, R.sub.2 is, independently of R.sub.1, a hydrogen, or a straight, branched or cyclic C.sub.1 -C.sub.6 alkyl radical, and R.sub.3 and R.sub.4 are independently a straight, branched or cyclic C.sub.1 -C.sub.6 alkyl radical; and D is a hydrogen, or a straight, branched or cyclic C.sub.1 -C.sub.6 alkyl radical.