A method for forming a multilayer coating film, comprising: a first aqueous coating composition application step of applying a first aqueous coating composition (A) to a surface of an article to form an uncured first aqueous coating film; a second aqueous coating composition application step of applying a second aqueous coating composition (B) onto the uncured first aqueous coating film to form an uncured second aqueous coating film; a clear coating step of applying a clear coating composition (C) onto the uncured second aqueous coating film to form an uncured clear coating film; and a curing step of heat-curing at once the uncured first aqueous coating film, the uncured second aqueous coating film, and the uncured clear coating film in the steps defined above to form a multilayer coating film, wherein the first aqueous coating composition (A) comprises a water-dispersible polyurethane resin (a1) and a viscosity modifier (a2), the second aqueous coating composition (B) comprises water and an organic solvent as diluent components besides solid components in a state of dilution to a coating viscosity, and contains, as a part of the organic solvent, an organic solvent having a solubility in water of 0.1% by mass or more and 7% by mass or less, in an amount of 0.4% by mass or more and 5.0% by mass or less per the total amount of the coating material, and also contains an organic solvent insoluble in water in an amount of 0.05% by mass or more and 2.5% by mass or less per the total amount of the coating material, and M B , which is a droplet mass of the second aqueous coating composition (B) at the time of applying the composition to the uncured first aqueous coating film, V B , which is a collision speed, and η A , which is a shear viscosity of the uncured first aqueous coating film measured at a shear rate of 10000 sec -1 , satisfy the following formula: M B V B / η A < 3.0 × 10 − 7 kg .m/s / Pa .s wherein M B , V B and η A are measured as described in the description. a first aqueous coating composition application step of applying a first aqueous coating composition (A) to a surface of an article to form an uncured first aqueous coating film; a second aqueous coating composition application step of applying a second aqueous coating composition (B) onto the uncured first aqueous coating film to form an uncured second aqueous coating film; a clear coating step of applying a clear coating composition (C) onto the uncured second aqueous coating film to form an uncured clear coating film; and a curing step of heat-curing at once the uncured first aqueous coating film, the uncured second aqueous coating film, and the uncured clear coating film in the steps defined above to form a multilayer coating film, wherein the first aqueous coating composition (A) comprises a water-dispersible polyurethane resin (a1) and a viscosity modifier (a2), the second aqueous coating composition (B) comprises water and an organic solvent as diluent components besides solid components in a state of dilution to a coating viscosity, and contains, as a part of the organic solvent, an organic solvent having a solubility in water of 0.1% by mass or more and 7% by mass or less, in an amount of 0.4% by mass or more and 5.0% by mass or less per the total amount of the coating material, and also contains an organic solvent insoluble in water in an amount of 0.05% by mass or more and 2.5% by mass or less per the total amount of the coating material, and M B , which is a droplet mass of the second aqueous coating composition (B) at the time of applying the composition to the uncured first aqueous coating film, V B , which is a collision speed, and η A , which is a shear viscosity of the uncured first aqueous coating film measured at a shear rate of 10000 sec -1 , satisfy the following formula: M B V B / η A < 3.0 × 10 − 7 kg .m/s / Pa .s wherein M B , V B and η A are measured as described in the description. <EOS>