Abstract: A cooling device for plastic moldings and a cooling method therefor shortening the cooling time required for the moldings 6 to be cooled in the die 3, without doing rapid cooling in the die 3, and can also prevent deformation such as warp of the moldings 6. The cooling device for air-cooling plastic moldings which are formed by a plastic molding machine 1 having a take-out portion 10 for taking out the moldings 6 and are taken out from the take-out portion 10 comprises an air cooling means 18 which is located in the vicinity of said take-out portion 10 for blowing cooling air over said moldings 6 immediately after being taken out from said take-out portion 10. The cooling device can be used to blow cooling air over the moldings 6 immediately after the moldings are taken out from said take-out portion 10.