The present invention provides a nitrogen-containing saturated heterocyclic compound of the formula [I] which is useful as a renin inhibitor.
wherein R
1
is a cycloalkyl group or an alkyl,
R
22
is an optionally substituted aryl and the like,
R is a lower alkyl group,
R
3
, R
4
, R
5
and R
6
are the same or different, and are a hydrogen atom, an optionally substituted carbamoyl, an optionally substituted alkyl, or alkoxycarbonyl,
or a pharmaceutically acceptable salt thereof.