A track condition evaluation method for evaluating a condition of a track along which a railroad car travels, the method comprising: using a measurement section to measure a travel speed of the railroad car, and also to measure a vibration acceleration of a vehicle configuration element configured by any one of a carriage body, a bogie (3A, 3B), an axle box, or a drive device provided at the railroad car, at a predetermined location on the track in a plurality of measurement time periods; using an evaluation index calculation section to calculate an evaluation index relating to travel of the railroad car by employing the measured vibration acceleration for each of the plurality of measurement time periods, wherein the evaluation index is an index expressed using the vibration acceleration of the vehicle configuration element associated with a track condition; using an analysis section to, based on the calculated evaluation index, the measured travel speed, and the measurement time period for each of the plurality of measurement time periods, derive a category score for each of the plurality of measurement time periods by performing multivariate analysis employing a relationship equation in which the evaluation index is a target variable, the travel speed is a quantitative explanatory variable, and the measurement time period is a qualitative explanatory variable, wherein the category score for the measurement time period expresses a degree of contribution of the measurement time period to the evaluation index; and using a track condition evaluation section to evaluate a change in condition at the predetermined location on the track based on a change in the derived category scores for the plurality of measurement time periods. using a measurement section to measure a travel speed of the railroad car, and also to measure a vibration acceleration of a vehicle configuration element configured by any one of a carriage body, a bogie (3A, 3B), an axle box, or a drive device provided at the railroad car, at a predetermined location on the track in a plurality of measurement time periods; using an evaluation index calculation section to calculate an evaluation index relating to travel of the railroad car by employing the measured vibration acceleration for each of the plurality of measurement time periods, wherein the evaluation index is an index expressed using the vibration acceleration of the vehicle configuration element associated with a track condition; using an analysis section to, based on the calculated evaluation index, the measured travel speed, and the measurement time period for each of the plurality of measurement time periods, derive a category score for each of the plurality of measurement time periods by performing multivariate analysis employing a relationship equation in which the evaluation index is a target variable, the travel speed is a quantitative explanatory variable, and the measurement time period is a qualitative explanatory variable, wherein the category score for the measurement time period expresses a degree of contribution of the measurement time period to the evaluation index; and using a track condition evaluation section to evaluate a change in condition at the predetermined location on the track based on a change in the derived category scores for the plurality of measurement time periods.