A process for producing a three-dimensional model is provided. The process includes (a) a layer formation step of forming a layer of a powder material having a refractive index n1 above a support, (b) a shape formation step of bonding the powder material layer into a predetermined shape by a binder that gives a refractive index n2, and (c) sequentially repeating the above steps. The absolute value of the difference between the refractive index n1 of the powder material and the refractive index n2 given by the binder is 0.1 or less, and the binder includes two or more types of binders selected from the group consisting of at least one type of colored binder, a white binder, and a colorless transparent binder.