Yonemura Daijiro (米村大滋郎 ) (Guitar & Vocals)
Yodogawa Yoshihiro (淀川由浩 ) (Drums & Vocals)
Fujiie Kazuyori (藤家和依 ) (Bass)
Ishigaki Daisuke (石垣大祐 ) (Keyboard & Vocals)
Igo Akun (伊郷アクン ) (Lead Guitar)
Like sempai units Otokogumi, TOKIO and fellow junior unit FiVe, the members of Question? are known for their talents with musical instruments. The unit, modeled after TOKIO, started out on May 2004, with four members, lead by MAD member, Noda Yuya as the lead guitarist, Yonemura Daijiro as lead vocalist and guitar, Fujiie Kazuyori as bassist and Yodogawa Yoshihiro as drummer. At first the unit played in sempai concerts and such, but soon started playing in Shounen Club for whenever FiVe members couldn't appear. Question? went ahead in early 2005 to replace FiVe in Shounen Club, and unlike FiVe started with originals such as Holy Heaven, first sung on January Shounen Club. In Summer 2005, the unit welcomed FiVe's keyboardist, Ishigaki Daisuke, as their own, and the unit became a full unit just like their sempais before them. They bought out their second and third originals, Precious Memories and Kanjite Miro, where we see the talents of each member. On October 2005, after one last performance of Precious Memories, Noda Yuya left the unit to rejoin his previous unit M.A.D. which was reformed, alongside junior unit Kis-My-Ft 2. With him leaving, Igo Akun joined Question? and took his place as lead guitarist, but didn't appear with the unit on Shounen Club until April 2006.
Since then Question? has carried the same five members, where not only is Yonemura known for his singing talents, but so is keyboardist, Ishigaki and drummer, Yodogawa. The 5 boys have appeared in numerous sempai and junior concerts alongside appearing on Shounen Club and others such as Playzone and One! The History of Tackey. Members have also appeared on Hadaka no Shounen sometimes. They have numerous songs such as Time Slip, Bitter-end, Head Banging Boogie and also a collaboration with junior unit A.B.C. called Naked. The unit has also had live concerts, one with Noda Yuya in Septemeber of 2005 and three in 2007 called You Gotta Rock.
In December of 2007, it was announced that the group would make a collaboration with Kondo Masahiko, forming the unit MATCHY with QUESTION?. They will release the single Mezamero! Yasei in January 23, 2008 to serve as the ending theme for the anime Naruto Shippuuden.