A blood cell separator includes a receiving container that includes an opening and a bottom surface, a tubular collection container that has a first opening, a second opening that is opposite to the first opening, and a filter that closes the second opening, and a vibration mechanism that vibrates the receiving container, at least part of the collection container being placed in the receiving container in a state in which the bottom surface of the receiving container faces the filter. The blood cell separator is thus configured so that clogging of the filter is suppressed, and the separation efficiency is improved.
