a cell microchip with which various measurements of the action of medicaments , etc . by the use of biological reaction using a small amount of cells can be accomplished simply within a brief period of time ; and a method of assay with the use of the cell microchip . in particular , there are provided a cell microchip comprising plastic substrate and , formed thereon , micro flow channel ; a method of assay with the use of cells characterized in that use is made of the cell microchip ; and a method of conducting biological inspection with the use of cells characterized in that use is made of the cell microchip .