Abstract: The present invention relates to an apparatus for tilting a keyboard of portable computer, in a manner that a rear end of the keyboard is raised up to a predetermined height by opening its cover, so that the user can operate keys of the keyboard more conveniently. The apparatus for tilting the keyboard of a portable computer of the invention can radiate heat generated from various electric components on a main PCB of a base, during operating the computer, through a ventilation space formed between a keyboard cage on the top side of the base and a bottom side of the keyboard when opening the cover. The apparatus in accordance with the present invention comprises: a keyboard of which both sides of a front portion are rotatably joined by hinge means to a front portion of a keyboard cage formed on a base. A cover is rotably engaged with the base by hinge means mounted within an interior of a rear side portion of the base to be engaged with at least a protruding member of the cover.