To provide a method for control of an extruding device and an extruding device, capable of precisely controlling extruding processing, even though the conditions are different.

One of the conditions of an initial condition in which the moving speed of the ram 18 is regulated by the pressure of operation oil including pressure loss corresponding to compression while compressing the operation oil in the ram cylinder 16, a proportional constant condition of in which the moving speed of the ram 18 is regulated while maintaining a predetermined correlation according to the pump flow rate fed into the ram cylinder 16 from the condition in which the compression of the operation oil is completed, and a later condition in which the moving speed of the ram 18 is regulated a while the compression of the operation oil is released and the pressure of the release is added to the pressure of the operation oil fed to the ram cylinder 16 is perceived, the movement of the ram 18 is controlled such that the pump flow rate is controlled to the pump flow rate to which the rate corresponding to the loss generated by the operation oil being compressed is added in the initial condition and the pump flow rate is controlled to the pump flow rate in which the rate corresponding to the increasing of the pressure by the compression of the operation being released in the later condition is subtracted.