Nitrogen-containing compounds represented by general formula (I) or salts thereof； and insecticides, miticides, sanitary harmful insect expellants, or harmful organism control agents, which contain the compounds or salts thereof as the active ingredient. In general formula (I), R is a nitro group or the like； Z is a substituted or unsubstituted aryl group or the like； R is a hydrogen atom or the like； Y is a nitro group or the like； n is an integer of 0 to 3； D is a 5- to 8-membered carbocyclic or heterocyclic group which may have also a substituent other than X； X is a group represented by general formula (II-1) [wherein R and R are each independently a hydrogen atom or the like]； A is a carbon atom or the like； and n1 is an integer of 0 to 2.
