The present invention, smoothness, excellent sharpness and water resistance, and to provide a multilayer coating film forming method capable of forming a multilayer coating film occurrence of popping is prevented or suppressed.
Multilayer coating film forming method of the present invention, step (1): The coating object was coated with an aqueous first colored coating composition (X), to form a first colored coating uncured on the object to be coated step, step (2): step of coating objects painted with an aqueous second colored coating composition (Y), to form a second colored coating of uncured thereon having a first colored coating of uncured, optionally, step (3): the object to be coated with a first colored coating and the second colored coating film of uncured uncured painted with clear paint (Z), the uncured thereon clear coating forming a step (4): the first colored coating of uncured second colored coating film uncured, optionally, a clear coating of uncured, heat, comprising the step of curing, an aqueous first 1 colored coating (X) is a blocked polyisocyanate compound (a) having a hydroxyl group-containing resin and (B) a specific block isocyanate groups Characterized in that it has.