As a pressure-sensitive adhesive composition for trapping small organisms, use is made of a composition comprising: (A) 70 to 98% by mass of liquid polybutene having a number-average molecular weight of 200 to 1200； (B) 1.0 to 8.0% by mass of high-pressure method polyethylene having a melt index of 0.04 to 35； (C) 1.0 to 8.0% by mass of butyl rubber having a Mooney viscosity ML1+8 (at 125oC) of 30 to 60； and (D) 5 to 29% by mass of an alicyclic hydrocarbon resin. Thus, a pressure-sensitive adhesive composition for trapping small organisms, which has a high pressure-sensitive adhesiveness and good coating properties to an adherend, and in which the starting materials of the pressure-sensitive adhesive composition can be easily obtained and the pressure-sensitive composition can be produced at a good workability, is provided.本發明係提供一種小生物捕獲用黏著性組成物，其係作為小生物捕獲用黏著性組成物之黏著性優異，且對被塗布材料之塗布作業性優異，黏著性組成物之原材料容易取得，且黏著性組成物製造時之作業性優異。本發明之小生物捕獲用黏著性組成物包含：(A)數量平均分子量200~1200之液狀聚丁烯70~98質量%；(B)熔融指數為0.04~35之高壓法聚乙烯1.0~8.0質量%；(C)木尼黏度ML1+8(125℃)30~60之丁基橡膠1.0~8.0質量%；及(D)脂環式烴樹脂5~29質量%。
