Examples of the coloring reagent as used include an AB coloring reagent (trade name: Alamar Blue, produced by Alamar Bioscience Co., Ltd.), a WST-1 coloring reagent, an XTT coloring reagent and a MTT pigment reductant. [0102] As a method in which the measurement can be carried out even if cells are dead, there is a method including selectively staining substances as contained in cells in the globu