A speed control device configured to control a speed of a vehicle travelling along a driving route including a plurality of road sections including first and second road sections, wherein a target speed is set for each of the plurality of road sections, the speed control device comprising: an actual speed acquiring section configured to acquire an actual speed of the vehicle; an actual position acquiring section configured to acquire an actual position of the vehicle; an acceleration/deceleration control section configured to control an acceleration/deceleration of the vehicle such that the actual speed converges to a target speed set for one of the plurality of road sections corresponding to the actual position; and a travelling resistance calculation section configured to calculate a travelling resistance of the vehicle in a travelling state, wherein a target speed for the second road section is set such that, in a case where the target speed is increased from a first target speed to a second target speed as the actual position moves from the first road section to the second road section, the actual speed is set to be increased from the first target speed to the second target speed by a primary delay between a start position to an end position of the second road section, and characterized in that the target speed for the second road section is set such that a variation of the target speed that increases by the primary delay is reduced as the travelling resistance calculated by the travelling resistance calculation section increases, the variation being relative to a travelling time of the vehicle, to thereby increase a setting time taken for reaching the second target speed from the first target speed as the travelling resistance increases. an actual speed acquiring section configured to acquire an actual speed of the vehicle; an actual position acquiring section configured to acquire an actual position of the vehicle; an acceleration/deceleration control section configured to control an acceleration/deceleration of the vehicle such that the actual speed converges to a target speed set for one of the plurality of road sections corresponding to the actual position; and a travelling resistance calculation section configured to calculate a travelling resistance of the vehicle in a travelling state, wherein a target speed for the second road section is set such that, in a case where the target speed is increased from a first target speed to a second target speed as the actual position moves from the first road section to the second road section, the actual speed is set to be increased from the first target speed to the second target speed by a primary delay between a start position to an end position of the second road section, and characterized in that the target speed for the second road section is set such that a variation of the target speed that increases by the primary delay is reduced as the travelling resistance calculated by the travelling resistance calculation section increases, the variation being relative to a travelling time of the vehicle, to thereby increase a setting time taken for reaching the second target speed from the first target speed as the travelling resistance increases.