He has an older sister whose support of Kin Ki Kids influenced his decision to join Johnny & Associates in 1996.
Thinking it might bode good luck, he sent his application to the agency on his elementary school graduation day and received a phone call weeks later from president Johnny Kitagawa himself, inviting him to attend a rehearsal instead of being auditioned.
In 2013, Matsumoto Jun played the role of Okuda Kosuke in the movie ‘Hidamari no Kanojo‘(Her Sunny Side) along with actress Ueno Juri in the latest movie of director Miki Takahiro (‘Solanin’, ‘Boku ga Ita’).‘Hidamari no Kanojo’ was filmed in January and to hit cinemas on October 2013.
In 2017, Matsumoto Jun played the role of Takashi Hayama in the Movie 'Narratage' along with actress Arimura Kasumi.
She was rambunctious, and he was all about business. I was pleasantly surprised to receive a call yesterday afternoon from an old friend, an acquaintance from the book club I'd attended years ago.
Prior to his debut as a singer with Arashi in 1999, Matsumoto started an acting career when he was cast as Teddy Duchamp for the stage play Stand by Me, which was based on the film of the same name. He portrayed a man diagnosed with CIDP struggling to recuperate and return to normal life with his wife and young daughter. The drama special received a viewership rating of 25.6%. but his breakthrough did not come until 2001 when he was cast as Hajime Kinda'ichi in the third season of Kinda'ichi Shōnen no Jikenbo, taking over the role from Tsuyoshi Domoto and co-starring opposite Anne Suzuki. In 2002, Arashi co-starred in their first movie together called Pikanchi Life is Hard Dakedo Happy in 2004. Due to this, Matsumoto is frequently referred to as one of the elite within the agency. Although the majority of Matsumoto's solos for albums and concerts are written by Arashi's staff, he has contributed lyrics for two of his solos: "La Familia" for the 2004 Arashi! and "Naked" in 2008 for the album Dream "A" Live under the penname "Jun". In 2005, Matsumoto took the most prominent role of his career to date when he was cast as Tsukasa Domyōji in the live-action adaptation of shōjo manga Hana Yori Dango. Co-starring opposite Mao Inoue, Shun Oguri, Shota Matsuda and Tsuyoshi Abe, the series was a success with an average viewership rating of 19.6%. He portrayed the lead character Yori Yūki , a high school student who falls in love and develops a romantic relationship with his younger twin sister. In 2008, Matsumoto took on his first jidaigeki role in a re-make of Akira Kurosawa's The Hidden Fortress, Kakushi Toride no San-Akunin: The Last Princess, with award-winning actors Hiroshi Abe, Kippei Shiina and Masami Nagasawa.