PROBLEM TO BE SOLVED: To provide a controlling method for the injection filling step of an injection molding machine in which injection speed control is performed even in a pressure holding step, and a defect in molding caused by gas remaining can be prevented.SOLUTION: The controlling method for the injection filling step of an injection molding machine includes: a control switching point setting step in which injection molding is performed with injection pressure setting in a pressure holding step as zero setting, and a speed/pressure switching point at which a defect in molding caused by gas remaining is not generated is set as a control switching point B` by the quality check of moldings; and an injection pressure holding speed setting step in which, after the control switching point, a transfer time for which it is transferred from an injection speed 2 and an injection speed 1 to an injection speed 2 is set, injection molding based on the control switching point B`, the injection speed 2 and the transfer
