PROBLEM TO BE SOLVED: To provide a novel compound that exhibits μ-opioid receptor antagonism, that has few side-effect, and that is useful in the prevention and treatment of pruritus; and to provide a pharmaceutical composition containing said compound.SOLUTION: Provided are: 3-azabicyclo[3.1.0]hexane derivative represented by the formula (I); and a pharmaceutical composition containing said derivative. [W is a sulfonyl group or a carboxyl group; Y is a single bond or the like; Z is a cycloalkyl group which may be substituted with a group selected from a halogen atom, a halogeno-alkyl group, a cyano group, an alkoxy group, an alkoxymethyl group and an aryl group; Ris H or an alkyl group; Ris H or a halogen atom; Ris an alkyl group, an alkenyl group, a cycloalkyl group or an alkoxymethyl group; and Ris a group having an indane structure.]【課題】μオピオイド受容体拮抗作用を示し、副作用の少ない、掻痒症の予防又は治療に有用な新規化合物、及び該化合物を含有する医薬組成物の提供。【解決手段】式(I)で表される、3-アザビシクロ[3.1.0]ヘキサン誘導体、及び該誘導体を含有する医薬組成物。[Wはスルホニル基又はカルボキシル基;Yは単結合等;Zはハロゲン原子、ハロゲノアルキル基、シアノ基、アルコキシ基、アルコキシメチル基、アリール基より選択される基で置換されていてもよいシクロアルキル基;R1はH又はアルキル基;R2はH又はハロゲン原子;R3はアルキル基、アルケニル基、シクロアルキル基又はアルコキシメチル基;R4はインダン構造を有する基]【選択図】なし