cell such as the size kind and nature of the cell is effected on real time from the detected value obtained each time a cell passes a popular analysis method is a method of judging the size of cells in conformity with the intensity of scattered light or a method of pre dyeing cells with a fluorescent reagent and seeing the creation of fluorescence to thereby discriminate the nature and kind of the cells control is effected by a control circuit not shown for a predetermined number of discharge nozzles this is four kinds of discharge nozzles may be driven in conformity with the conditions of desired properties such as the size kind and nature of the cells discriminated on the basis of the result of the analysis effected on real time in the calculation circuit droplets containing therein cells if they fall intactly will fall into the compartment e of the capture container 19 however if droplets of the physiological saline solution are discharged from the discharge nozzles 18 they will completely non elastically collide with the droplets containing desired cell therein as shown in fig2 and will change the direction in which the cell droplets fall thus the droplets will not fall into and be gathered in will fall into compartment e but the compartment c of the capture.