A portable electronic device includes a housing body having a bottom wall and a pair of grooves formed in the bottom wall, a cover body, a pair of hinges interconnecting the housing and cover bodies, a pair of foot modules respectively corresponding to positions of the grooves, and a pair of cam mechanisms each connected to one hinge and an adjacent foot module. Each foot module includes a foot pad movable between retracted and protruding position. When the cover body is pivoted from a closed position to an open position, each hinge actuates a respective cam mechanism which in turn actuates the foot pad to move the latter from the retracted to the protruding position.