To provide a method for magnetic force sorting of fine particles which increase the efficiency of analytical precision or separativework after separating magnetized fine particles from non-magnetized ones and also can sort magnetic force of the fine particles group within the desirable magnetic range, and also to provide a microwell for magnetic force sorting to be used in this method. 着磁性微粒子と非着磁性微粒子との分離後の分析精度や分離作業の効率を向上させ、かつ、所望の磁性の範囲で微粒子群を磁力選別可能な微粒子の磁力選別方法およびこれに用いる磁力選別用マイクロウェルを提供する。 - 特許庁