Abstract : In this experiment, we conducted a psychological evaluation for screen response time in the operation of a touch panel type multifunction device. In the evaluation, 16 office workers participated and used a scale to assess comfort for 7 different response times from 0.1 to 2 seconds. The evaluation showed that the response time range from 0.2 to 0.4 seconds made users comfortable in the function selection operation. Key Word : Response Time, Touch Panel, Usability -1 - BULLETIN OF JSSD 2017 日本デザイン学会 デザイン学研究 200