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Straightener (ストレイテナー, Sutoreitenā) is a Japanese alternative rock band. The band started out as a duo with Atsushi Horie (vocals/guitar) and Shinpei Nakayama (drums) in 1998. They established an independent label named Ghost Records in 2002. Hidekazu Hinata joined the band as bassist in 2003, giving the band a heavier sound. In October of the same year they released a single, "Traveling Gargoyle" from Toshiba EMI.

Straightener have performed at numerous festivals and live tours. The band toured all over Japan during their Linear tour in 2007, as well as performing a joint tour in December 2013 with Asian Kung-Fu Generation to celebrate both bands' 10-year anniversaries. Both bands performed in Korea, Singapore, and Taiwan along with a local band from each country.

• Atsushi Horie – guitar, vocals, keyboards

  Also plays guitar and sings for the band FULLARMOR. Has a solo project called "ent", best known for the Solanin film soundtrack.^[1]

• Shinpei Nakayama – drums

  Also played drums for the band The Predators, with Sawao Yamanaka (guitar, The Pillows), and Jiro (bass, Glay). Drummer for the band another sunnyday and Zantö.^[2]

• Hidekazu Hinata – bass

  Former bassist of ART-SCHOOL and Zazen Boys. Also plays bass for the bands FULLARMOR and Nothing's Carved in Stone.

• Jun Ōyama - guitar

  Joined Straightener on October 1, 2008. Also plays guitar for another sunnyday. Former guitarist for the band ART-SCHOOL.

• "Senshi no Shikabane no March" (2000)
• "Another Dimensional" (2000)
• Silver Record (2002)
• Silent Film Soundtrack (2003)
• "Traveling Gargoyle" (2003)
• "Tender" (2004)
• "Killer Tune / Play the Star Guitar" (2004)
• "The Remains" (2005)
• "Melodic Storm" (2006)
• "Berserker Tune" (2006)
• "Six Day Wonder" (2007)
• "Train" (2007)
• "Little Miss Weekend" (2008)
• "Lightning" (2009)
• "Clone / Donkey Boogie Dodo" (2009) (The Shock Labyrinth Theme Song (CLONE))
• "Man-Like Creatures" (2010)
• "Vandalism / Silly Parade" (2011)
• "You and I / Hitsuji no Mure wa Oka o Noboru" (2011)
• "From Noon Till Dawn" (2012) (Yūsha Yoshihiko to Akuryou no Kagi Opening Theme)
• "Super Magical Illusion" (2014)
• "Winter Sun / The World Record" (2014)
• "The Place Has No Name" (2015) (Fuben na Benriya Opening Theme)
• "Inochi no Ato ni Saita Hana" (2015)
• "Day to Day" (2015)
• "Sea Glass" (2016)
• "Akari" (2017)
• "Boy Friend" (2018)
• "The Future Is Now / Time Leap" (2018) (Digimon ReArise Theme Song (The Future Is Now))
• "Braver" (2018) (Angolmois: Record of Mongol Invasion Opening Theme)
• "Spiral" (2019)
• "Graffiti" (2020)
• "Sakebu Hoshi" (2020)
• "Sayonara dake ga Oshiete Kureta" (2020)
• "Crank Up" (2021)
• "246" (2023)
• "Silver Lining" (2023)
• "Invisible" (2024)
• "Skeletonize!" (2024)

• Black Star Luster (2005)
• Emotion Picture Soundtrack (2006)
• Remember Our Drinking Songs -Hello Dear Deadman Tour 2006 (2006)
• Linear Motor City (2007)
• Emotion Picture Soundtrack 2 (2009)
• Nexus Tour Final (2009)
• The Parade of Creatures (2010)
• Long Way to Nowhere Tour (2012)
• Eternal Rock Band: 21st Century Rock Band Tour 2013 (2014)
• Step Into My World Tour 2016 (2017)
• 21st Anniversary Rock Band (2019)
• Nana-Iro Electric Tour 2019 (2020) (with Ellegarden and Asian Kung-Fu Generation)

• Dragorum with The Pete Best (2001)
• Untitled split cassette tape with Art-School (2002)

• Straightener's official site
• Straightener's fansite
• Straightener forum
• Straightener at AllMusic