A fall-prevention leg portion is provided projecting rearward from the central bottom portion of a stationary platen. This leg portion is formed with a pin hole, which receives a pivot pin that fixes the stationary platen for angular motion around a vertical axis, and bolt holes, which receive tilt adjusting bolts for adjusting a longitudinal tilt of a mold mounting surface of the stationary platen with respect to the vertical axis. The parallelism between the stationary platen and the movable platen can be easily adjusted by regulating the angular motion of the stationary platen around the pivot pin and the longitudinal tilt of the stationary platen by the adjusting bolts.