Acceleration and automation of immunohistochemical staining are achieved as follows: an automatic electric field immunohistochemical staining apparatus is configured to provided with a sample mounting unit, a solution supply unit, an electric field stifling unit, and a washing unit; the sample mounting unit on which a glass substrate with a tissue specimen fixed thereto is mounted and the electric field stirring unit that includes an upper electrode are operated in coordination to activate an antigen in the tissue specimen; the sample mounting unit and the solution supply unit containing various solutions are operated in coordination to supply a primary-antibody-containing solution to the tissue specimen; the sample mounting unit and the electric field stirring unit are operated in coordination to perform an antigen-antibody reaction of the antigen in the tissue specimen and a primary antibody; and the electric field stirring unit and the washing unit are operated in coordination.