A driving assisting for calculating risk potential by considering a response delay by the driver and transmitting information related to the risk potential to the operator in a haptic manner. A controller is provided to estimate the response delay based on an operation performed by the operator. Based on the estimated response delay, the controller calculates a future position at which the risk potential is to be calculated. The longer the response delay, the remoter the future position is. The shorter the response delay, the nearer the future position is. The calculated risk potential at the future position may be transmitted to the operator via a pressing force from one of right and left side portions of a driver's seat occupied by the operator.