Arioka Daiki (有岡 大貴) is a member of the Johnnys group Hey! Say! JUMP.
- Name: Arioka Daiki (有岡 大貴)
- Nickname: Arioka-kun, Arioka, Daiki, Dai-chan
- Profession: Singer, actor
- Birthdate: April 15, 1991
- Birthplace: Narashino, Chiba Prefecture
- Blood Tyoe: A
- Height: 164.5cm
- Weight: 47kg
- Shoe size: 25.5cm
- Best Features: Eyes and Cheek
- School: Narashino Municipal-Fifth (Middle School), Horikoshi Gakuen (High-school)
- Agency: Johnny's Jimusho
- Admired senpai: Katori Shingo (SMAP)
- Admired senpai in Arashi: Ohno Satoshi
- Respected people: Justin Bieber
- Date entering Johnny's: 2nd June 2003
- Former groups: J.J. Express, Hey! Say! 7
- Favorite Food: Omelette, Fried Rice
- Disliked Food: Tomato, Mayonnaise, Green Peas
- Favorite Sport: Soccer
- Favorite Subject: English
- Disliked Subject: Mathematics
- Favorite Animal: Lion and Monkey
- Animals that I want to keep: Penguin
- Favorite Colors: Red and Orange
- Favorite Word: Fantastic (奇想天外)
- Favorite Type of Girl: A Cheerful Girl
- First Love: Primary School Year 1
- Family: Parents, Older Brother (5 years older, Daisuke)
On June 2, 2003, he joined Johnny & Associates as a trainee. As a Junior he was a member of J.J.Express.
On April 3, 2007, he joined Hey! Say! 7 starting with a public performance at a KAT-TUN concert.
On September 21, 2007, he began performing as a member of Hey! Say! JUMP.