The purpose of the present investigation is to clarify individual differences in subjective roughness comparison task. To analyzing individual differences in point of relationship between physical and sensory measurements, the multidimentional paired comparison model is proposed. Using the model, data which were obtained through the following experiment were analyzed. The experiment was designed for investigation of correspondence between both measurements. 18 Test pieces (BsBM) with turned surfaces were prepared in which Rrms, mean spacing of profile irregularity peaks, WEA and radius of profile peaks were factorially combined. Seven skilled labors in an optical industry were served as subjects in Experiment. By the model analysis, individual differences are obtained and represented in the profile patterns. For testing the validity of the model, Carroll-Chang's internal vector model analysis of same data was carried out. As results, the individual differences were described as vectors in a multidimen-sional feature space. Configuration of Eigen vectors (test pieces) derived from the internal vector model analysis are clearly shown that principal physical characteristics which affected the human judgment are Rrms and mean spacing of profile irregularity peaks. Relation between both models are discussed. Practical aspects of the findings of the present investigation are also discussed.