In this research, it aimed at the information provision for the activation of the product development for elderly people, and the actual commercialization targeting the chair of the household used most in daily life. Researchers have developed a chair for the elderly based on universal design and Ergonomics process and sat high. For this purpose, the research process is divided into 3 stages of product commercialization research stage in the research stage of product manufacture in the basic material research stage, and the execution target and the way of achievement to be achieved in each stage are systematically I made a plan and proceeded my research. This paper details the product commercialization research stage, which is the final stage of the three stages of the research process. The maximum load bearing performance of the prototype manufactured based on the research and the endurance performance evaluation proposal of the main components of the chair are established and done. Performance tests included maximum seating load evaluation, auxiliary damper durability performance evaluation, backrest repeat behavior performance evaluation, and so on. In addition, we performed evaluation of satisfaction by using prototype chair for elderly people of real user. Based on this research process, we have acquired intellectual property rights with prototypes that have been completed, and achieved good design awards.