To provide a driven distance integrated value storage system for vehicles which can effectively prevent alteration of data.

The driven distance integrated value storage system for vehicles includes: a driven distance acquiring means for acquiring a driven distance of a vehicle; a plurality of storage means for dividing and storing information relating to an encoded driven distance integrated value; a reference driven distance calculation means for calculating a reference driven distance by decoding the information stored in the plurality of storage means; a driven distance integrated value calculation means for calculating a driven distance integrated value by adding the driven distance of the vehicle obtained by the driven distance acquiring means to the reference distance calculated by the reference driven distance calculation means; and an encoding/dividing means for encoding the driven distance integrated value calculated by the driven distance integrated value calculation means, dividing the information relating to the encoded driven distance integrated value, and dividing and storing the divided information in the plurality of storage means. The reference driven distance storage means determines at a predetermined timing whether any part of the information stored in the plurality of storage means includes an error, and corrects a part of the information which is determined to include an error.