In a running test, wheels 2 of a vehicle 1 are mounted on rollers 3. Each roller 3 receives torque corresponding to the running resistance N, which is a value corresponding to the running resistance applied to the vehicle 1 on the actual ground. Further, in the test, the actual friction coefficient .mu.ch between the wheels 2 and the rollers 3 is calculated. The running resistance N is then corrected in such a manner that the actual friction coefficient .mu.ch becomes equal to the friction coefficient .mu.j on the actual ground that is calculated based on the slip ratio of the wheels 2 with respect to the rollers 3. This approximates the running resistance applied to the vehicle 1 by the rollers 3 to the running resistance applied to the vehicle 1 on the actual ground as the torque is applied to the rollers 3 in correspondence with the corrected running resistance N. This prevents the drive force produced by the vehicle 1 in the running test from becoming different from the drive force that should be produced by the vehicle 1 running on the actual ground.