The present invention provides a coated product having excellent corrosion resistance and excellent finish by a 3-coat 1-bake method; the method including the steps of forming cured coating film (A1) comprising cationic electrodeposition coating composition (A) on a metal object to be coated; forming first colored coated film (B1) by coating first colored aqueous coating composition (B); forming second colored coated film (C1) by coating second colored aqueous coating composition (C) on uncured first colored coated film (B1); forming clear coated film (D1) by coating clear coating composition (D) on uncured second colored coated film (C1); and simultaneously curing uncured first colored coated film (B1), uncured second colored coated film (C1), and uncured clear coated film (D1).