PROBLEM TO BE SOLVED: To provide a remedy having an adjustment function of strong α7 nicotinic acetylcholine receptor (α7nAChR) and for diseases related to choline workability of a central nervous system (CNS) and/or a peripheral nervous system (PNS).SOLUTION: The new benzimidazole derivative is a compound expressed by a formula (I) or its salt pharmaceutically allowed, where A is CRor N; X-Y-Z is N-CO-NRR, etc.; R, R, Rand Rare Calkyl, etc.; Ris H, etc.; R, R, Rand Rare Ccycloalkyl; etc.; R, Rand Rare H, etc.; Rto Rare H, etc.; and n is 1 or 2.【課題】強いα7ニコチン性アセチルコリン受容体(α7nAChR)の調節作用を有し、中枢神経系(CNS)及び/又は末梢神経系(PNS)のコリン作動性に関する疾患などの治療薬の提供。【解決手段】式(I)の化合物又はその製薬学的に許容される塩。[Aは、CR1D又はN、X-Y-Zは、N-CO-NR4AR5等、R1A、R1B、R1C及びR1Dは、C1-6アルキル等、R2は、H等、R4A、R4B、R5及びR7は、C3-10シクロアルキル等、R6、R8及びR9は、H等を表し、R10~R17は、H等、nは、1又は2を表す]。【選択図】なし