PURPOSE: To enable automatically continuous injection molding, by performing repeatedly mold clamping, injection, cooling and mold release by a cam to a mold arranged in a mold holding space of the circumference of a rotator while the same is being rotated intermittently.

CONSTITUTION: A plurality of pieces of mold holding spaces 2 which are penetrated through a rotator 1, which is revolved and driven intermittently, in parallel with a revolving shaft of the same is provided on the circumferential part of the rotator 1 at about constant intervals and a pair of a male and female molds 4, 5 is provided movably within the spaces 2. Then at the time of a revolution of the rotator 1, the molds 4, 5 are moved by cam mechanisms 6 (6A, 6B), 7 (7A, 7B). With this construction, a molded article A is made to shift automatically to a second state wherein the molded article A is released from the mold by extruding the same outward through the space 2 from a first state wherein a molding cavity 3 is constituted.