Portable back support

A portable back support comprising a base plate extending substantially the height of said support, cushion means attached to a front of said base plate and having an upper portion and a lower portion, said lower portion having a pair of laterally spaced extremities, said base plate having an arcuate shape in transverse section thereby enabling said extremities to provide lateral support, adjustable expansion means enabling the contour of said cushion means to be varied, said expansion means comprising an inflatable bladder capable of providing increased support for the lumbar spine of a user, said bladder having a rear surface which is firmly supported by the front of said base plate, and means for displacing said bladder vertically relative to said base plate so as to enable said expansion means to accommodate variations in the location of the lumbar spine.