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Source: MUJI web page and trademark registration No. 6385131. The previous version they used "ヒラギノ" font in 無印良品, I have never seen MUJI used this type of fonts, both in Japanese or Chinese. MUJI often use ゴシックMB101, but their logo is not even ゴシックMB101, I believe that Naoto Fukasawa designed the MUJI logo.