A portable articulated support device has an articulated quadrilateral frame having four straight sides formed of elongate thin rectangular panels pivotally connected at opposed ends with opposed sides disposed in parallel spaced relation. The frame can be expanded and collapsed between a generally rectangular configuration and a generally diamond-shaped rhombus configuration to be supported in a generally horizontal plane upon the lap of a seated user for supporting various objects on the lap of the seated user. A first pair and a second pair of the panels each are pivotally connected together at a first end, and the first pair and second pair of panels are pivotally and detachably connected together at a second end. The first pair of panels can be detached from the second pair of panels and each pair can be pivoted about their first end to assume an overlapped parallel superposed relation for compact storage.