A cabinet mounted step stool can be collapsed to a narrow horizontal profile for storage without compromising usefulness of the cabinet. The step stool is supported on support channels fastened to two side walls of the cabinet. A pair of fixed track channels are supported on the support channels with the fixed track channel openings facing each other, within which two sliding track channels slide with one on the left and the other on the right. Four step support assemblies, each of which comprises a step support with one end pivotally attached to a roller and the other end pivotally attached to a foot. Two rollers slide within the left and other two rollers slide within the right sliding track channel. Two steps are supported on four corners by the four step support assemblies. When extended, the step stool provides two steps with approximately 13½″ rise in height.