PROBLEM TO BE SOLVED: To provide a cell capturing processing system that, when a plurality of cell capturing apparatuses are moved for selecting and concentrating cells contained in a biological sample such as circulating tumor cells (CTC) contained in blood by filtrating them, enables a plurality of specimens to be processed efficiently and at a low cost by shortening a time required for various processes performed to the cells and simplifying them; and a processing liquid supply unit capable of being incorporated into the cell capturing system.SOLUTION: The cell capturing processing system comprises a plurality of cell capturing apparatuses, and each one of processing liquid supply tanks respectively holding processing liquids different from each other according to processing, in order to performing at least one processing about cells presenting in a biological sample, the one processing being selected from a group consisting of washing processing, replacement processing, immobilizing processing, transmissi
