PROBLEM TO BE SOLVED: To provide a vascular embolic agent in which a liquid becomes a gel state while passing through a catheter, and embolization is achieved at a target vessel easily.SOLUTION: A vascular embolic agent comprises a fine particle comprising a crystalline polymer, a copolymer of a monomer (1) and a monomer (2), and a dispersion medium.COPYRIGHT: (C)2015,JPO&INPIT【課題】カテーテルを通過する間に液体がゲル状となり、より簡便に目的血管で塞栓することができる血管塞栓剤を提供する。【解決手段】結晶性高分子を含有する微粒子、モノマー(1)とモノマー(2)との共重合体、及び分散媒を含む血管塞栓剤。【選択図】図1