Abstract: A collapsible, portable child's play-pen, which may be foldably collapsed onto two half-members which are pivotably coupled together along an axis and which together form a base for the play-pen, which may then be subsequently folded together to form a compact portable unit. First and second frame members, each pivotably coupled to the base along parallel but mutually opposite edges of the base, form one set of opposite side walls of the play-pen. Each of the first and second frame members are provided with a respective pair of first and second pivotable linking arms. One end of each of the first pair of linking arms is pivotably coupled to a first frame member, and similarly one end of each linking arm of the second pair of linking arms is pivotably coupled to the second frame member.