抄録
The below-knee prosthesis "Rabbit" for track which was developed by introducing the method of the product design has the beauty of appearance evaluated, on the other hand some people have had deep-rooted criticism against functionality as impression. Changes of impression evaluation of Rabbit to ver.4.0 (2013) which played an active part in the international match from ver.1.0 (2009) of the first stage are followed.
