Vehicle hill hold assist system

The Berganfahrhilfe system prevents the vehicle behaves in an unexpected manner, even when the detected driving direction or the detected driving force of the driving wheels is not normal, so that the impression of the vehicle can be improved. [Means for Solving the Problems] The ECU (20) of the hill-start aid system (1) comprises a Captured-state determination unit (25) for determining a detected state of shift lever position switches (14) and a hold control unit (26) for performing hold control (the reduction of the braking force of the braking device 5 ) controls at release of the brake pedal (2), and the holding control unit (26) includes a first hold control execution unit (27) to be selected when a detection result of the Captured-state determination unit (25) is normal, and a second hold control execution unit (29) to be selected when a detection result of the Captured-state determination unit (25) is abnormal. In the hold control, the second holding control execution unit (29) keeps the vehicle for a shorter period (second local retention period T2) is fixed as the time period (first local retention period T1) for which the first holding control execution unit (27) holds the vehicle stationary.