Provision of new therapeutic agents for chronic obstructive pulmonary disease. A quinuclidine derivative represented by the general formula (1) and a medicine containing the same. Wherein R 1 represents a hydrogen atom, a halogen atom, a lower alkyl group, a haloalkyl group, a lower alkoxy group or a haloalkoxy group; Y represents —C (C═O) —O—, —CH 2 — or —CH 2 O—. M represents an integer of 1 to 5; Z represents an oxygen atom or a sulfur atom; 1 represents a number of 0 or 1; n represents an integer of 0 to 4; X − represents an anion; The ring substituent represents 1,3-bond or 1,4-bond, provided that when m is 3, l is 1, and n is 0, R1 is a halogen atom, a lower alkyl group, a haloalkyl group, a lower alkoxy group. A group or a haloalkoxy group.)新たな慢性閉塞性肺疾患治療剤の提供。 一般式(1)で表されるキヌクリジン誘導体及びこれを含有する医薬。(式中、R1は水素原子、ハロゲン原子、低級アルキル基、ハロアルキル基、低級アルコキシ基又はハロアルコキシ基を示し;Yは-C(C=O)-O-、-CH2-又は-CH2O-を示し;mは1~5の整数を示し;Zは酸素原子又は硫黄原子を示し;lは0又は1の数を示し;nは0~4の整数を示し;X-はアニオンを示し;キヌクリジン環の置換基は1,3-結合又は1,4-結合を示す。ただし、mが3、lが1、かつnが0の場合、R1はハロゲン原子、低級アルキル基、ハロアルキル基、低級アルコキシ基又はハロアルコキシ基を示す。)