To improve a preparing function when an object article is formed by a lamination molding (forming) method.

A material feeding section (ink jet head) 1 and a promoting factor feeding means 2 are two-dimensionally movably supported respectively by a second stage 25 and a first stage 22. In this case, the material feeding section discharges a material M to constitute the object article. The promoting factor feeding means 2 feeds a promoting factor F to promote a phase transformation of the discharged material M. At the same time, the material feeding section 1 and the promoting factor feeding means 2 are rotatably supported by rotating mechanisms 24 and 21. Thus, the irradiation of the material M and the promoting factor F is made possible to a forming surface at an optional angle, and an overhung section can be formed without a support.