An information providing device installed in a leader vehicle that leads a follower vehicle, for providing the follower vehicle with guidance prepared by the leader vehicle, the information providing device that includes a state detector configured to detect a state change in the leader vehicle to output a detecting signal and a guidance generator configured to receive the detecting signal from the state detector, the guidance generator configured to prepare, in response to the detecting signal, guidance to guide the follower vehicle, the guidance including a photographed image of a view ahead of the leader vehicle.