A rollator is disclosed in this invention. The rollator includes: a base frame front wheel assemblies and rear wheel assemblies respectively mounted on both sides of the base frame an inverted U-shaped supporting pipe a H-shaped armrest bracket connection pieces having block grooves thereon a slide control lever for cooperating with the block grooves a seat plate a spring element wherein the base frame is provided with unidirectional hinged seats both bottom ends of the supporting pipe are hinged to the base frame, and both side arms of the supporting pipe are provided with slide holes facing each other the armrest bracket has bottom portions hinged to the unidirectional hinged seat. The rollator has a simple structure and can be used for various situations in both folded and unfolded state.
