Car sharing settlement method and car sharing management system

A car sharing management system comprising:

• an IC reader-writer;
• and
• a car sharing management device,
• wherein the IC reader-writer includes:
• a reading unit configured to, when a user uses a vehicle of car sharing, read a balance of electronic money stored in an IC chip of the user, the electronic money being prepaid;
• an acquisition unit configured to acquire a usage fee of the vehicle by the user from the car sharing management device;
• a subtraction unit configured to, when the balance is less than the usage fee, subtract a prescribed amount equal to or less than the balance from the electronic money of the IC chip;
• and a collection unit configured to collect a difference between the usage fee and the prescribed amount during use or after use of the vehicle by the user.