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Mamehara Issei

Mamehara Issei promoting "CHALLENGER" (2021)

Mamehara Issei (豆原一成) is a Japanese artist under Lapone Entertainment. He is a member of the Japanese pop group JO1.


  • Name: Mamehara Issei (豆原一成)
  • Birthdate: May 30, 2002 (2002-05-30) (age 20)
  • Birthplace: Okayama, Japan
  • Blood Type: O
  • Height: 173cm
  • Weight: 69kg
  • Hobbies: Dancing, singing, looking at clothes on Mercari, making TikToks
  • Specialties: 90's Hip-Hop, baseball, swimming, doing Kamen Rider impressions




  • He placed 1st on Produce 101 Japan.
  • His official color is Red.
  • He has an older sister.
  • He was a dance instructor before joining Produce 101 Japan.