In ancient times, the name used to be pronounced 'raseimon,' following the pronunciation of the Han period in China, but its reading and spelling gradually fluctuated, and after the yokyoku 'Rashomon' was announced, it settled as 羅生門 and pronounced raseimon or rashomon.
古くは「らせいもん」と漢音読みしたが、次第に読み・表記ともども揺れるようになり、謡曲「羅生門」発表以降は羅生門（らせいもん、らしょうもん）の表記が定着した。