PURPOSE: To improve the uniformity of pressure applied on a body to be molded, and prevent the occurrence of defective articles by interposing a flexible film and a fluidable lubricating material between the body to be molded and the mold.

CONSTITUTION: Between a mold 1 and a body to be molded, a low frictional structure 12 is interposed that consists of a flexible film 12a and a fluidable lubricating material 12b. In this instance, the flexible film 12a and the lubricating material 12b are respectively permitted to come into contact with the body to be molded 2 and the mold 1. When the body 2 to be molded is pressed by a pressing body 3, the flexible film 12a expansion-deforms freely and allows the bite of the body to be molded 2. The body to be molded 2 bitten herein is pressed along the mold 1, however, since a lubricating material 12 is interposed between the mold 1 and there and thus the contact resistance is extremely small, the pressing forces exert nearly uniformly over the body to be molded 2. In substitution of such flexible film and lubricating oil, two sheets of flexible films 13a, 13b, and a lubricating film 13 can be employed which consists of a fluidable lubricating material 13c contained therebetween.