A portable electronic apparatus includes a base having a and a tilt leg slidably connected to the base. The tilt leg is slideable between a tilting position for tilting the keyboard forwardly and an untilting position for storing the tilt leg in the base. The base has an external release switch having an internal projection for cooperating with a biased fixing member positioned on an opposite side of the tilt leg, releasing the tilt leg from the tilting position and the untilting position. The tilt leg includes a slot to provide clearance for the release switch projection during sliding movement of the leg. The tilt leg is compact because of the sliding construction.