To provide a braking device operating stably in a light vehicle such as a wheelchair.

Each of a pair of pendulum bodies 18 on an upper side and a pair of pendulum bodies 18 on a lower side is mutually connected by each gear part 21. In an intermediate part, a force to approximate the pendulum bodies 18 each other is applied by a tension spring 22. When the vehicle exceeds a safety speed, each pendulum body 18 moves to the outside against the tension spring 22, a brake pad 20 is in pressure contact with a brake shoe 23, and brake is applied.