CONSTRUCTIVE DEVICE INTRODUCED INTO A KEYBOARD FOR SECURITY OF INFORMATION AND SECRET PROCESSES STORED BY ELECTRONIC MEANS characterized by including a protective mechanism for the keyboard system which makes attacks impossible by mechanical manipulation, mechanical perforation, part separation, chemical short circuits or the insertion of intrusive devices. One of the objectives of this invention is to provide a constructive device for a keyboard in order to impede the insertion of unauthorized access devices into their internal circuits, guaranteeing the internal inviolability of installed equipment at the point of sale and providing a significant increase in the security of the keyboard system.