The three-dimensional image forming method prepares two or more kinds of ink, ejects and superimposes the two or more kinds of ink with an ink jet system on a supporting member and forms a three-dimensional image on the supporting member with the two or more kinds of ink ejected and superimposed on the supporting member. Each of two or more kinds of ink contains three-dimensional image forming particles different from each other in diameter. Further, the method forms the three-dimensional image that has been increased in filling factor. Alternatively, two or more kinds of ink contains a first kind of ink containing solid particles and a second kind of ink having physical properties that are different from physical properties of the solid particles.