Three-dimensional molding method

A three-dimensional molding method comprising the steps of:

• repeatedly forming the following steps a number of times:
• forming a flat surface by sliding of a squeegee against a powder layer, and
• sintering the powder layer with a laser light or an electron beam;
• then cutting a periphery of the sintered layers, in order to mold an object to be molded, a plurality of struts that support the object from a lower side and which are intended to be removed after molding, a middle partition plate that supports the struts from below and is intended to be removed after molding, and lower supporting members that support the partition plate from below and are intended to be removed after molding,
• wherein the steps of forming and sintering include the step of forming upper parts of the struts to employ one of:
• truncated circular conic shapes, or
• partial truncated circular conic shapes
• that are reduced in diameter toward a top thereof.