| Masaru Hamaguchi | |
| Native Name: | 濱口優 |
| Native Name Lang: | ja |
| Birth Date: | January 29, 1972 |
| Birth Place: | Konohana, Osaka, Osaka, Japan |
| Height: | 168 cm--> |
| Medium: | Television |
| Years Active: | 1990–present |
| Employer: | Shochiku Geino |
| Genre: | Owarai |
| Children: | 1 |
| Relatives: | |
| Notable Works: | Yoiko |
is a Japanese comedian and actor from Konohana-ku, Osaka. He is the tsukkomi of the manzai duo, Yoiko, with his partner Shinya Arino.
Hamaguchi and Arino were classmates that graduated high school and formed a manzai duo in 1990.[1] The duo would make their first major televised appearance on Mecha-Mecha Iketeru! in 1996.[2]
Hamaguchi was born into a family that owns a coffee shop called "Hamayū" (はまゆう) in Konohana-ku, Osaka, named after the poisonous spider lily from his grandfather's love of lily flowers on the beach.[3]
In 2013, Hamaguchi began dating the gravure idol Akina Minami. They got married on May 25, 2018,[4] [5] initially giving birth to a stillborn[6] [7] before his wife gave birth to a healthy baby, their son in 2022.[8]