An automatic speed control device includes: an upper limit speed setting part for setting a first speed as an upper limit speed during running on a main road and setting a second speed slower than the first speed as the upper limit speed during running on a connecting road; a target speed setting part for setting a target speed to less than or equal to the upper limit; and a speed control part for controlling a vehicle speed based on the target speed. The speed control part makes the vehicle accelerate according to a depression amount of the accelerator pedal when the pedal is depressed. The upper limit speed setting part sets the upper limit speed to a speed faster than the second speed and less than the first speed when the vehicle speed has become faster than the second speed due to depression of the pedal.