Provided is a therapeutic drug for diseases associated with central nervous system (CNS) and/or peripheral nervous system (PNS) cholinergicity, diseases associated with smooth muscle contraction, endocrine diseases, diseases associated with neurodegeneration, and the like, said therapeutic drug having strong α7 nicotinic acetylcholine receptor (α7 nAChR)-regulating activity and that contains a compound represented by formula (I) or a pharmaceutically acceptable salt thereof. [In formula (I), A is CR