A drug store "MatsumotoKiyoshi" was the biggest chain in 2015, according to the research by Nikkei newspaper. Its market share was 8.7%. The industry-wide total sales of 2015 were 6 trillion yen, increased 1.1% from 2014.
|Store||Market share (%)|
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.