Speed control device for vehicle

A speed control device for a vehicle comprising:

• a vehicle speed obtaining means for obtaining a speed of the vehicle;
• a shape obtaining means for obtaining a shape of a curve existing ahead of the vehicle;
• a reference determining means for determining an appropriate vehicle speed, by which the vehicle is to appropriately travel through the curve, and a reference point, which exists on the curve and which is a point by which the speed of the vehicle is to be decreased down to the appropriate vehicle speed, on the basis of the shape of the curve;
• a distance obtaining means for obtaining a relative distance of a zone between the reference point and the vehicle;
• a target vehicle speed determining means for determining a target vehicle speed for decreasing the speed of the vehicle down to the appropriate vehicle speed on the basis of the reference point, the appropriate vehicle speed and the relative distance;
• a vehicle speed controlling means for controlling the speed of the vehicle on the basis of the target vehicle speed and the speed of the vehicle;
• and
• an acceleration operation quantity obtaining means for obtaining an operation quantity of an acceleration operating member, which is to be operated by a driver of the vehicle, wherein
• the target vehicle speed determining means includes a modification means for modifying the target vehicle speed on the basis of the operation quantity so that the target vehicle speed in a case where the operation quantity is greater than zero becomes a greater value than the target vehicle speed in a case where the operation quantity is zero, wherein the modification means starts modifying the target vehicle speed when the operation quantity exceeds a predetermined value which is greater than zero.