INJECTION MOLDING METHOD AND INJECTION MOLDING MACHINE

A molding injection pressure Pi and a molding clamping force Pc are determined in advance to obtain a parting opening amount Lm, which is a predetermined gap, between a movable mold 2m and a fixed mold 2c of a mold 2 during injection filling, and the molding injection pressure Pi and the molding clamping force Pc are determined to obtain a molding injection pressure capable of molding a good product and a mold clamping force capable of molding a good product, respectively, thereby setting a specific molding condition Dc, setting a fast injection speed Vf from the start of injection, which is higher than the injection speed set by the specific molding condition Dc, and setting a fast injection section Zf for continuing the fast injection speed Vf as a fast injection condition Df, mold-clamping the mold by the molding clamping force Pc during molding, and setting the molding injection pressure Pi to a limit pressure Ps, injecting and filling resin R into a mold 2 by the fast injection condition Df from the start of injection, and injecting and filling resin R by the specific molding condition Dc when the fast injection section Zf ends.