KANSEI can be defined as the human ability to translate stimulus into impression. When the KANSEI is defined as ability, KANSEI ability is varied with individuals. Actually, some subjects may reproduce to translate stimulus into perceptions, but another subjects may not; while some subjects may translate some perceptions into various impressions, but another subjects may not. As a result, KANSEI data includes individual differences. If the variety of the individual differences on these translations can be measured as KANSEI ability, it can be helpful for analyzing the structural model of KANSEI evaluation. In this paper, it is supposed that a hierarchy structural model, which includes the perceptual stage, image stage and evaluation stage. Indices to measure translation abilities from stimulus into perceptual stage and from the perceptual stage into the image stage are proposed using the Semantic Differential (SD) method. KANSEI Quality of hubcap designs is included as a case study, to which the proposed indices are applied.