An in-vehicle system has a control device that controls a vehicle, and a charging device provided in the vehicle, in which a portable terminal is chargeable. The charging device has a power supply part that supplies power to the portable terminal, and a communication part that communicates with the portable terminal when the portable terminal is installed on the charging device. The control device has an authentication part that authenticates first authentication information received by the communication part from the portable terminal, and a vehicle control part that controls whether to permit starting of the vehicle based on an authentication result of the first authentication information.