Hiroki Watanabe was born in 1989. He is in the doctoral course at Graduate School of Engineering, Kobe University. He received B.Eng. and M.Eng. degrees from Kobe University in 2012, 2014, respectively. His research interest is wearable computing and ubiquitous computing. He is a research fellowship of Japan Society for the Promotion of Science. He is a member of IPSJ. He likes playing a guitar.