A method of waterproofing a coated electric wire attached connector terminal which is formed of metal material and which includes a barrel part which is crimped to a conductor which is exposed from a sheath, a terminal part, a connecting plate which is formed between the barrel part and the terminal part, and connects the barrel part and the terminal part. The method includes an adhesive material applying step in which adhesive material is applied to the connecting plate, and a molded part molding step in which the coated electric wire attached connector terminal is placed in a metal mold to form an injection space around the connecting plate, the barrel part and the sheath and resin is injected into the injection space to cover the connecting plate, the barrel part and the sheath with a resin molded part.