Control device of injection molding machine, injection molding machine, and control method for injection molding machine

A control method for an injection molding machine including an injection member that is provided in a cylinder heating a molding material and an injection drive source that causes the injection member to advance to fill an inside of a mold unit with the molding material, the control method comprising:

• performing a holding pressure process for controlling a pressure acting on the molding material from the injection member,
• wherein the holding pressure process includes a process for performing a retreat speed limitation to limit an actual speed value of the injection member to a first set value or less during retreat of the injection member, and a process for releasing the retreat speed limitation in a case where a first set condition is satisfied while the retreat speed limitation is performed.