The present invention provides a benzazepine compound that can maintain for a long period of time the blood level of tolvaptan enabling to provide the desired pharmaceutical effects. The benzazepine compound of the present invention is represented by general formula (1) wherein R 1 represents a -CO-(CH 2 ) n -COR 2 group (wherein n is an integer of 1 to 4, and R 2 is (2-1) a hydroxy group； (2-2) a lower alkoxy group optionally substituted with a hydroxy group, a lower alkanoyl group, a lower alkanoyloxy group, a lower alkoxycarbonyloxy group, a cycloalkyloxycarbonyloxy group, or 5-methyl-2-oxo-1,3-dioxol-4-yl； or (2-3) an amino group optionally substituted with a hydroxy-lower alkyl group), or the like.
