PROBLEM TO BE SOLVED: To provide coagulable magnetic particles, a method of using the same and a coagulated body forming system, capable of easily forming a coagulated body at a prescribed position.SOLUTION: The coagulated body forming system includes: coagulable magnetic particles 1 at least containing magnetic particles 10 which can be accumulated by using magnetic irradiation and a coagulable compound 11 which can form the coagulated body 2 by a coagulated body forming means 80 a magnetic irradiation means 70 for accumulating uncoagulated coagulable magnetic particles 1 at a prescribed position and the coagulated body forming means 80 for forming the coagulated body of the coagulable magnetic particles 1 at the prescribed position.COPYRIGHT: (C)2013,JPO&INPIT【課題】所望の位置に簡便に凝固体を形成可能な凝固性磁性粒子、及びその使用方法、並びに凝固体形成システムを提供する。【解決手段】本発明に係る凝固体形成システムは、磁気照射の利用によって集積可能な磁性粒子10と、凝固体形成手段80によって凝固体2を形成可能な凝固性化合物11と、を少なくとも含有する凝固性磁性粒子1と、非凝固状態の凝固性磁性粒子1を所望の位置に集積させる磁気照射手段70と、所望の位置に、凝固性磁性粒子1の凝固体を形成する凝固体形成手段80とを備えるものである。【選択図】図3B