A filtration instrument to be used to remove foreign matter in a cell suspension wherein the filter container uses a transparent or semi-transparent material and is constructed so that solids that have been captured by the filter can be removed easily. Specifically, the filter container is constructed so that solids that have been captured by the filter can be removed easily by cutting the filter container by scissors. This construction serves to prevent the admixture of foreign matter in the cell suspension and, should foreign matter become admixed, facilitates the explanation of the cause of the admixture of foreign matter by removing and analyzing the foreign matter.
