PURPOSE: To provide the braking device for agricultural machinery, which can effectively utilize a limited space so as to concentrically arrange a sensor mechanism and a switching lever near a brake pedal and which can securely add the braking operation of the inside rear wheel coupled with the steering operation to the operation of a brake pedal and which can safely and smoothly perform the machine running and the brake control.

CONSTITUTION: A brake link 17, a coupling link 16, and a base end link 18 are arranged around the same shaft in a sensor mechanism, and the inclined surfaces 21, 22 provided in the abutment peripheral surface of the coupling link 16 and the base end link 18 are slid for turning so as to connect engagement parts 19, 19, which are provided in the abutment peripheral surface of the brake link 17 and the coupling link 16, freely to be disconnected.