PROBLEM TO BE SOLVED: To provide a braking device which can stably brake rotation of a wheel, and further, can perform changeover to a mode in which rotation of the wheel is not braked without separation of a contact member from the wheel.SOLUTION: A braking device comprises a contact member 31 which brings an outer peripheral surface 311 into contact with a wheel 2, a shaft member 32 which rotatably supports the contact member 31, and a regulation member 33 which regulates rotation of the contact member 31. The contact member 31 is rotated together with rotation of the wheel 2 in one direction from the state of contacting the wheel 2 and is pressure-welded to the wheel 2, a space between the shaft member 33 and a portion contacting the wheel 2 is changed by rotation, and a friction force given to the wheel 2 is also changed. The regulation member 33 can selectively stop the contact member 31 between a first stop state such that the contact member 31 is further rotated from a state in which a contact part space C becomes maximum, and a second stop state such that the contact member 31 is further rotated from first stop state.SELECTED DRAWING: Figure 1【課題】車輪の回転を安定して制動することができ、さらに、接触部材を車輪から離間させずに車輪の回転を制動しない態様に切り換え可能な制動装置を提供する。【解決手段】外周面３１１を車輪２に接触させる接触部材３１と、接触部材３１を回動可能に支持する軸部材３２と、接触部材３１の回動を規制する規制部材３３とを備え、接触部材３１は、車輪２に接触した状態から車輪２の一方向の回転に伴い回動して車輪２に圧接し、軸部材３３と車輪２に接触する箇所との間隔が回動することで変化し車輪２に付与される摩擦力も変化するものであり、規制部材３３は、接触部間隔Ｃが最大となる状態よりも接触部材３１が更に回動した第１停止状態と、第１停止状態よりも接触部材３１が更に回動した第２停止状態とにおいて、選択的に接触部材３１を停止させることができるものである。【選択図】図１
