It is an objective of the present invention to provide a non-invasive transdermal immunizing technology by which inflammation and lump do not appear at the skin unlike conventional transdermal immunizing methods with subcutaneous administration and the development amount of antibody in serum is increased. The S/O type transdermal immunizing agent according to the present invention comprises an antigen-surfactant complex and an oil phase wherein the antigen is covered with the surfactant in the complex the complex is in a solid state and the complex is dissolved or dispersed in the oil phase.
