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This study was based upon the premise that individual Kansei works to evaluate an object, and that Kansei differs from person to person. It focused on a three-dimensional impression from the various elements which provoke this impression in an object. It aimed to investigate the characteristics of a product thickness, felt when a person recognized and/or touch an object. This study approached a sensitive measure method about the impression of thickness using several objects of different forms. To classify evaluation results by a standard, subjects were grouped based on their response similarities. As a result, we were able to suggest a new Kansei category by the way of evaluation and feeling of objects’ thickness. Three types of experiments were carried on, and physical objects were produced using a three-dimensional printer. Experiment A was to discriminate a three-dimensional object from a plane one; experiment B was to evaluate the thickness by difference of weight; and experiment C was to evaluate the thickness by the shape of the top and sides of the objects. As a result, the objects were separated in plane and solid by area and thickness. In the objects that fit into one hand, it became the standard that around 10% of the length and breadth divides a plane and a solid. In addition, the impressions of the thickness were different by the shape of the sides. When the side shape was concave it was felt thinner than the real thickness, on the other hand, the convex was felt thicker than its real size. This study suggested a standard of the Kansei category, namely generality and accuracy. In this study, simple shapes were used and possibility of a new Kansei category was proposed. This method might be applied to the evaluation of more complicated products.

<I>Kansei</I> Evaluation in the Thickness of Physical Objects Based on Tactile Impression