Fused nitrogen-containing heterocyclic compounds

It provides excellent monoacylglycerol acyltransferase compound or a pharmaceutically acceptable salt thereof represented by the following general formula (I) with 2 inhibitory activity. [Formula 1] (I) [In the formula, Ring A is partially saturated heteroaryl group, an aryl group or a heteroaryl group, R ## STR2 ## (II) (In the formula, V has the formula -CR W is a single bond or C Ring B represents a C ) Y represents a nitrogen atom or the formula N R m and n are identical or different and represent an integer of 0-1. ]