To mold an accurate molding efficiently by a method in which an inner mod is kept nearly horizontally without being impacted with regard to an outer mold during the molding or demolding of a molding manually by making the front end be caught by the ground and otherwise and extracted/ inserted easily and surely.

A molding mold supports an inner mold which has the first pantograph-type expandable/contractable member by the rotational operation of an operation spiral lever 10 and side plate-bottom plate parts 9, 9 openable/ closable through the second expandable/contractable member 13 (13a, 13b) to be connected with the right and left lower ends of the first expandable/ contractable member and installed extractably/insertably to make the upper and lower be approximately parallel in an outer mold 2 comprising front and rear mirror plates 5, 5' which are installed peripherally developably and assemblably and right and left side plates 6, 6' by a lower part support lever 15 equipped with the inner mold movably on an erection table 14 and upper part support lever 16 installed above in parallel.