The present invention provides a compound represented by general formula (I) which has excellent retinoic acid receptor-related orphan receptor &gamma；t inhibitory activity and IL-17 production inhibitory activity, or a pharmaceutically acceptable salt thereof. (In the formula, U represents a phenyl group, pyridyl group, tetrahydrofuryl group, tetrahydropyranyl group or benzyl group which may be independently mono- to tetra-substituted by groups selected from among halogen atoms, C1-C6 alkyl groups and C1-C6 alkoxy groups, a C1-C6 alkyl group, a C1-C6 halogenated alkyl group or the like； R1 represents a hydrogen atom, a halogen atom, a hydroxyl group or the like； R2 represents a hydrogen atom or a C1-C6 alkyl group； R3 represents a hydrogen atom, a halogen atom, a hydroxyl group or the like； R4 represents a hydrogen atom or the like； R5 represents a C1-C6 alkyl group which may be independently mono- to tetra-substituted by groups selected from among a hydroxyl group and C1-C6 alkoxy groups, a hydrogen atom or the like； R6 represents a C1-C6 alkyl group which may be independently mono- or di-substituted by groups selected from among C1-C6 alkylsulfonyl groups and a hydroxyl group, a hydrogen atom, a hydroxyl group or the like； R7 represents a hydrogen atom or a fluorine atom； R8 represents a hydrogen atom, a fluorine atom or the like； R9 represents a hydrogen atom； T represents a single bond, an oxygen atom or a group represented by formula -NH-； Y may be the same or different and each represents a halogen atom or a C1-C6 alkyl group； m represents an integer of 0-3； a saturated ring containing a nitrogen atom may be fused with a cyclopropane ring to form a fused ring； and n represents an integer of 1-3.)本發明提供一種以下述通式(I)表示之化合物或其等藥學上可容許的鹽，其具有優異的視網酸受體相關孤兒受體γt抑制作用及抑制IL-17產生之作用，[式中，U為可獨立地經1至4個選自鹵素原子、C1-C6烷基及C1-C6烷氧基之基取代的苯基、吡啶基、四氫呋喃基、四氫哌喃基或苄基、C1-C6烷基、C1-C6鹵化烷基等；R1為氫原子、鹵素原子、羥基等；R2為氫原子或C1-C6烷基；R3為氫原子、鹵素原子、羥基等；R4為氫原子等；R5為可獨立地經1至4個選自羥基及C1-C6烷氧基之基取代的C1-C6烷基、氫原子等；R6為可獨立地經1至2個選自
