||Monodispersed Janus microparticles having both surface amphiphilicity and magnetic properties were prepared in a facile and effective manner. The seed particles having hydroxyl groups on the surface were introduced through copolymerization and surface hydrolysis reaction of styrene and vinyl acetate. Amphiphilic Janus particles bicompartmentalized with hydrophilic and hydrophobic hemispheres were prepared by seed swelling of tetradecyl acrylate and subsequent photo-polymerization. Further, in order to prepare functional Janus particles, nickel nanoparticles were patched by electrostatic attraction on a hydrophilic hemisphere. As a result, a Janus particle in which nickel nanoparticles were selectively patched to a hydrophilic hemisphere was prepared. It is expected that the nickel-patched Janus particles can be used in the preparation of Pickering emulsions with excellent stability and magnetic responsiveness.