Portable device

A portable device, comprises:

• a first unit comprising a guide member extending in a sliding direction;
• and
• a second unit comprising a sliding member that slides in a groove of the guide member, the second unit facing the first unit in a retracted state,
• wherein the first unit comprises a convex section, the convex section projecting toward a second unit side and extending in the sliding direction,
• wherein the second unit comprises a hollow section in a place corresponding to the convex section of the first unit,
• wherein at least part of the guide member is formed in the convex section and formed in such a manner that the part of the guide member gets into the hollow section formed in the second unit,
• wherein the convex section of the first unit has such a shape in a cross section taken in a direction perpendicular to the sliding direction that the convex section projects to a larger extent toward the second unit side as the convex section gets closer to an edge of the first unit from an inner part of the first unit,
• wherein a hollow section of the second unit has such a shape that the hollow section sinks deeper away from the first unit as the hollow section gets closer to an edge of the second unit from an inner part of the second unit, and
• wherein, in a closed position of the portable device, an upper surface of the first unit extends parallel to a bottom surface of the second unit.