PURPOSE: To provide the control device for an injection molding machine reducing the obstruction of operability and screen observation and capable of reducing the danger exposing a worker or a screen to an injury/damage.

CONSTITUTION: Key sets 4a, 4b controlling the work process of a machine main body are arranged on both sides of a screen 3. The keyboard 5 inputting the processing data of a control device is attached to a first revolving plate. The first revolving plate is attached to the horizontal shaft under the screen 3 and revolved at a time of the non-use of the screen 3 to cover at least the lower part of the screen 3 to protect the same. A second revolving plate 6 is arranged above the screen 3 and revolved to be allowed to fall to cover and protect the upper part of the screen 3. The second revolving plate is also used as a reflection preventing means for intercepting obstructive light so as not to turn the same to the screen 3.