A driving mode switching device includes a determination section, a notification section, a detection section, and a control section. The determination section is configured to determine whether a state has occurred in which automatic driving needs to be terminated. The notification section is configured to notify a driver of the instruction for performing a switching operation as a predetermined operation of a vehicle in the case of determining, by the determination section, that the state has occurred in which the automatic driving needs to be terminated. The detection section is configured to detect the switching operation. The control section is configured to switch travelling from automatic driving to manual driving in the case of detecting the switching operation by the detection section.