To provide a braking device having a function of restricting an unnecessary movement of a wheelchair when a user stands up and the like, and requiring no operation of rearward movement when the user sits on the wheelchair.SOLUTION: The braking device includes: a contact member 51 which comes into contact with a wheel 2 by a self-weight； a shaft member 52 which rotatably supports the contact member 51； and a separation mechanism 7 which displaces the contact member 51 which is in a contact state to a separate state. When in a contact state, the contact member 51 rotates to pressure-contact with a wheel 2 along with a rotation of the wheel 2 in a direction of a rearward movement of the wheelchair. As a result, the rotation increases a distance between the shaft member 52 and a contact point with the wheel 2, thereby increasing a friction force applied to the wheel 2. When the force is applied to a seat part, the separation mechanism 7 displaces the contact member 51 from the contact state to the separate state, and when the force is released, the contact member 51 is returned to the contact state.SELECTED DRAWING: Figure 4【課題】利用者が立ち上がる際等に、車椅子が不用意に移動してしまうことを抑える機能を有し、かつ、車椅子に利用者が着座した状態で後進する際の操作を不要とする制動装置を提供する。【解決手段】自重によって車輪２に接触する接触部材５１と、接触部材５１を回動可能に支持する軸部材５２と、接触状態の接触部材５１を、離間状態に変位させる離間機構７とを備え、接触部材５１は、接触状態において、車椅子が後方に移動する方向の車輪２の回転に伴い回動して車輪２に圧接し、軸部材５２と車輪２に接触する箇所との間隔が回動することで大きくなり車輪２に付与される摩擦力も大きくなるものであり、離間機構７は、座部に力がかかると接触部材５１を接触状態から離間状態に変位させ、座部に力がかからなくなると接触部材５１を接触状態に戻すものである。【選択図】図４
