Abstract: Folding planar structure for use as a changing surface for infants, particularly while away from home. A plural-part rigid board assembly includes a unitary cushioning pad cemented to the parts and hinging them together, and has sliding rod structure for board-to-board connection holding the three parts rigidly in plane when in use; parts of the sliding rod structure are always in view and evidence by position whether the assembly is safely secured together. When folded for storage the sliding rod assembly provides handle structure for carrying and also stand structure preventing the assembly from getting wet or soiled when rested on a floor or leaned against a wall.