A driving mode switching control device (6) that outputs a signal to switch from an automatic driving mode to a manual driving mode, wherein the device comprises: an acquisition unit (611) that acquires sensing data indicating illuminance measured by an illuminance sensor (17) and stores the sensing data in a storage unit (631); a determination unit (613) that determines, on the basis of the sensing data, whether the environment in the advancing direction of a vehicle satisfies a prescribed condition suitable for switching the driving mode during a preset period for performing the switching; and a signal output unit (615) that outputs a signal for performing the switching when the environment in the advancing direction of the vehicle has been determined to satisfy the prescribed condition.