The present invention relates to a supporting plate or combiplate (1) which preferably is used as an extended keyboard support (6), especially for mouse operations, and with a view to provide a supporting plate (1) which is made of simple and inexpensive parts, but giving a combined support for both the mouse to be operated, as well as for the forearm and the wrist of the user, it is suggested according to the present invention that the supporting plate or combiplate (1) comprises a base plate (2) which completely or partly is covered with a layer (3) for favouring mouse operation, and which comprises means (4) for detachably affixing the base plate (2) to a working desk or a working plate (6).
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