Cell observation apparatus, an electric stimulator, and cell observation method

Cell observation apparatus 1 is a cell observation apparatus 1 for observing the cells retained by the microplate 20 wells 21 for holding a sample S containing cells are arrayed, micro for placing a microplate 20 a plate holder 11, the electrical stimulation portion 16 where the electrode pairs 17 are arrayed comprising an anode 17b and the cathode 17a, so that the electrode pairs 17 is positioned within the well 21 of the microplate 20, the electrical stimulation portion 16 and a data analyzer 50 for controlling the position, well 21 side of the distal end of the cathode 17a extends from the front end of the well 21 side of the anode 17b.