A carpool system is a system in which a vehicle that can autonomously travel on a predetermined route or a route based on a request of each of a plurality of users is used communally by the plurality of users. The carpool system includes a riding condition setting unit configured to set an attribute of each of the plurality of users as a riding condition for the users, and an attribute determination unit configured to, when the user rides the vehicle or reserves the vehicle for riding, determine whether the attribute of the user satisfies the riding condition.