Abstract: An upper die 1 of a movable die corresponding with a lower die 2 of a stationary die is composed of a die body 3 and a die fitting member 4, in which a back insert 29, a hydraulic cylinder 23 and a pressure receiving portion 30 as a holding member of an insert 20 forming a cavity 22 is abutted to the die fitting member 4 by being urged upward by a spring 32. After resin, fed into the cavity 22, is compressed with the insert 20 by lifting the die fitting member 4 down, when the die fitting member 4 is lifted up at the degree of slightly opening S, by lifting the insert 20 down to be relatively to the die fitting member 4 with an eject pin 34, a space A between a molding 44 and the insert 20 is to be smaller, and the molding 44 is pushed out by causing the eject pin 34 to lift the insert 20 down when the upper die 1 and the lower die 2 are separated.