A wear testing device, comprising: a holding portion that holds a rubber sample (S1; S2); a rotation body comprising a circumferential surface that comes into contact with the rubber sample; and a pressing mechanism that applies a pressing force on the rubber sample held by the holding portion toward the circumferential surface; the wear testing device comprising a plurality of holding portions, and the rubber sample held by each of the plurality of holding portions being independently and simultaneously pressed against the circumferential surface of the rotation body in rotation such that abrasion debris produced via contact between each of the rubber samples and the circumferential surface falls downward; and characterized in that: the wear testing device is configured such that the abrasion debris produced via contact between each of the rubber samples and the circumferential surface are used to determine the relative wear resistance of the rubber samples; and in that the wear testing device further comprises a weighing device that measures a weight of the abrasion debris of each of the rubber samples; and in that the wear testing device further comprises a plurality of receiving boxes that separately receive the abrasion debris of each of the rubber samples, the receiving boxes being disposed below the position where each of the rubber samples and the rotation bodies come into contact. a holding portion that holds a rubber sample (S1; S2); a rotation body comprising a circumferential surface that comes into contact with the rubber sample; and a pressing mechanism that applies a pressing force on the rubber sample held by the holding portion toward the circumferential surface; the wear testing device comprising a plurality of holding portions, and the rubber sample held by each of the plurality of holding portions being independently and simultaneously pressed against the circumferential surface of the rotation body in rotation such that abrasion debris produced via contact between each of the rubber samples and the circumferential surface falls downward; and characterized in that: the wear testing device is configured such that the abrasion debris produced via contact between each of the rubber samples and the circumferential surface are used to determine the relative wear resistance of the rubber samples; and in that the wear testing device further comprises a weighing device that measures a weight of the abrasion debris of each of the rubber samples; and in that the wear testing device further comprises a plurality of receiving boxes that separately receive the abrasion debris of each of the rubber samples, the receiving boxes being disposed below the position where each of the rubber samples and the rotation bodies come into contact. the wear testing device is configured such that the abrasion debris produced via contact between each of the rubber samples and the circumferential surface are used to determine the relative wear resistance of the rubber samples; and in that the wear testing device further comprises a weighing device that measures a weight of the abrasion debris of each of the rubber samples; and in that the wear testing device further comprises a plurality of receiving boxes that separately receive the abrasion debris of each of the rubber samples, the receiving boxes being disposed below the position where each of the rubber samples and the rotation bodies come into contact.