SPEED CONTROL DEVICE

A speed control device sets a target speed of the own vehicle to a basic speed that is a set speed set in advance or sets the target speed of the own vehicle to a basic speed that is a speed equal to or less than the set speed in which a distance to a preceding vehicle is maintained at a predetermined distance or more when there is a preceding vehicle. The speed control device sets the target speed of the own vehicle to a correction speed instead of the basic speed when the speed control device determines that an adjacent lane is congested and a speed difference between the speed of the own vehicle and an average speed or a lowest speed of another vehicle in the adjacent lane is equal to or more than a first reference value.