Nikkei Press estimated the market share of hotels in Japan in 2015. According to it, Prince Hotel chain has the biggest share (10%). The industry-wide total sales in 2015 were 1.73 trillion yen.
Figure: 2015 Hotel Market Share in Japan
|Hotel||Market share (%)|
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.