| abstract |
A water-repellent film is formed on a first connection surface (16) of a first element (12) containing any one of a macromolecular material, a metallic material and an inorganic material. The water-repellent film is subjected to an activation treatment and is thereby converted into a film (20) which has high hydrophilicity and a nylon 6 contact angle of less than 25 °. A second connection surface (18) of a second element (14) containing at least one thermoplastic resin different from the macromolecular material is placed on the first connection surface (16) comprising the film (20), whereupon the second element (14) is heated and melted. Then, the molten second member (14) is cooled and solidified to connect the first connection surface (16) and the second connection surface (18). |