An information notifying device in accordance with the present disclosure includes a first communication circuit, a second communication circuit, a clock, and a controller. The first communication circuit receives first information regarding an estimated arrival time at which transportation equipment will arrive at a destination. The second communication circuit receives second information regarding a remaining battery capacity of a battery installed in an external device. The clock keeps a current time. The controller calculates a first charging time necessary to charge the external device to a fully charged state based on the second information, and outputs information prompting to charge the external device at a first timing based on the first information, the current time and the first charging time.