PROBLEM TO BE SOLVED: To provide an auxiliary wheel unit which enables improvement of straightness and operability of a dolly which does not include an auxiliary wheel.SOLUTION: An auxiliary wheel unit 1 includes: a support part 20 detachably fixed to a dolly including three or more casters and an auxiliary wheel 11 which is supported by the support part 20 so as to travel in a straight line. At least a part of the auxiliary wheel 11 is disposed at an inner side of the three or more casters in a plan view in a state where the support part 20 is fixed to the dolly.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2018,JPO&INPIT【課題】補助車輪を備えていない台車の直進性および操作性を高めることができる補助車輪ユニットの提供を目的とする。【解決手段】3つ以上のキャスタを備えた台車に着脱可能に固定される支持部20と、支持部20に、直進可能に支持された補助車輪11と、を備え、支持部20が台車に固定された状態で、補助車輪11の少なくとも一部が、平面視で3つ以上のキャスタの内側に配置される、補助車輪ユニット1。【選択図】図5
