Novel nitrogen-containing heterocyclic compound

Provided are: a novel nitrogen-containing heterocyclic compound, which has an aldosterone synthase-inhibiting activity and, therefore, is useful for preventing and/or treating various diseases or symptoms associated with aldosterone and/or improving the prognosis of such diseases or symptoms, or a pharmacologically acceptable salt thereof; a method for producing the same; utilization of the same; a medicinal composition which comprises the aforesaid compound or a pharmacologically acceptable salt thereof as an active ingredient, etc. More specifically, provided are: a compound represented by general formula (I) [wherein each symbol is as defined in the description] or a pharmacologically acceptable salt thereof; a method for producing the same; utilization of the same; a medicinal composition which comprises the aforesaid compound or a pharmacologically acceptable salt thereof as an active ingredient, etc.