An electrostatic powder coating method includes spraying a charged powder coating material including powder particles that contain a thermosetting resin and a thermosetting agent, and an external additive that includes oxide particles containing at least one of titania and alumina to electrostatically attach the powder coating material to an object to be coated, and heating the powder coating material that is electrostatically attached to the object to be coated to thereby form a coating film, wherein a content Ac of the oxide particles in the powder coating material that is electrostatically attached to the object to be coated and a content Ao of the oxide particles in the powder coating material before being sprayed satisfy a relationship of Expression: Ao×0.80≤Ac≤Ao×1.20.