Abstract: Portable potty-chair that readily folds to a compact size, thus providing a toilet trainer that is easily transportable. To attain such a potty-chair, four pairs of pivotally crossed legs, with adjacent legs pivotally attached to connecting bases, form the chair frame. The frame is coupled to the corners of a rectangular seat where the seat has an opening through which waste may pass. In an embodiment, the portable potty chair includes a disposable liner with an elasticized edge to hold the liner in place. In an embodiment, the disposable liner includes a waste receptacle that occupies the seat opening.