A portable confinement apparatus having an enclosure (10, 30) for confining a person upon a mattress. The enclosure (10, 30) is formed of a flexible material having a base face (38), at least four side faces and a roof (36) which define a void (50), with a pocket (40) for the mattress. A frame (200, 20, 22, 24A, 30) has four base (22, 32) members arranged in a rectangle with two bridge members (24A), arranged over the base (22, 32) members. At least part of each base (22, 32) member is integrally secured to the base (22, 32) section and at least part of each bridge member is integrally secured to the roof (36) section. The enclosure (10, 30) is provided with at least two closable openings (60A) on different sides (34). An opening (160C) may extend into the roof (36) section. Support struts (226A, 226C, 26A) and a stabilisation system are also described to increase stability and prevent tipping. Members may be telescopic to increase the portability of the apparatus.