His father was actor Kōichi Satō, and his father often took him to filming locations since he was a child. On the set of TV series Pride in 2004, He said that he remembers Takuya Kimura, the lead actor, playing with him when he was a child.[2] Feeling that those around him expected him to be an actor in the future as a matter of course, he began to deny becoming one during his adolescent years.[3] However, by the time he turned 18, he said he had made up his mind to live as an actor himself.[3][2] When he was selected to appear in the television series La Grande Maison Tokyo in 2019, he responded to being told that he was riding on his father's coattails, "I became an actor after I was prepared to be told such things."[4] He said he chose Kanichiro by removing his family name Satō from his stage name because of his father's image and he wanted to challenge himself as an actor, independent of his father.[4]
His first TV series appearance was in 2018 in Midnight Journal: Hunt for the Missing Kidnapper! The Truth of the Seventh Year[10] and his first starring role in a film was Running Again in 2019.[11]
^""三世俳優"という視線は覚悟の寛一郎 「実力派でも演技派でもない。ましてやイケメンでもない」 目指す役者像は常にまっさら状態" [Kanichiro is prepared to be seen as a third-generation celebrity. "I'm not a talented actor, nor am I a good-looking actor. The image of the actor he aspires to be has always been a blank slate."]. daily (in Japanese). 2023-04-21. Retrieved 2024-07-28.
^ ab"佐藤浩市の息子・寛一郎は 日本映画界が注目するサラブレッド" [Koichi Sato's son, Kanichiro, is good pedigree who has caught the attention of the Japanese film industry.]. CREA (in Japanese). Bungeishunju Ltd. 2019-02-22. Retrieved 2024-07-28.
^ ab"寛一郎、俳優の道以外なかった 「佐藤浩市の息子」という名" [Kanichiro had no other choice but to become an actor: The name "Koichi Sato's son."]. cinematoday (in Japanese). 2017-09-24. Retrieved 2024-07-28.
^ ab"佐藤浩市の息子・寛一郎「2世」は覚悟「口にするのが怖かった」俳優 名字外して勝負!10月日曜劇場出演" [Koichi Sato's son, Kanichiro, is prepared for "riding his father's coattails" and is "I afraid to say it".]. sponichi (in Japanese). Sports Nippon News. 2019-09-22. Retrieved 2024-07-28.
^ ab"寛一郎" [Kanichiro]. eiga.com (in Japanese). 2024. Retrieved 2024-07-28.
^ ab"寛一郎" [Kanichiro]. natalie (in Japanese). Natasha, Inc. 2024. Retrieved 2024-07-28.
^"2018". kinenote (in Japanese). Kinema-Junposha.Co.Ltd. 2019-02-10. Retrieved 2024-07-28.
^"第33回 「高崎映画祭」受賞発表!最優秀作品は『斬、』!4年ぶりの特別大賞は『花筺/HANAGATAMI』最優秀監督賞は瀬々敬久と濱口竜介の両監督に!" [The 33rd Takasaki Film Festival announced the award winners! The Special Grand Prize for the first time in four years went to “Hanagatami”, and the Best Director Award went to Takahisa Zeze and Ryusuke Hamaguchi!]. cinefil (in Japanese). 2019-01-09. Retrieved 2024-07-28.
^ ab"【鎌倉殿の13人】"公暁"寛一郎「殺します」"実朝"柿澤勇人「殺されます」 第45回前に爆笑トークショー" ["Kukyo" Kanichiro "I will kill" "Sanetomo" Hayato Kakizawa "I will be killed" Laugh-out-loud talk show before the 45th episode.]. oricon (in Japanese). 2022-11-27. Retrieved 2024-07-28.
^"世間を震撼させた連続誘拐殺人事件。 犯人は捕まり、事件は解決したかに思えた。 しかし…事件は終わっていなかった。" [A serial kidnapping and murder case shook the world. The perpetrators were caught and the case seemed to be solved. However... the case was not over.]. tv-tokyo (in Japanese). TV Tokyo Corporation. March 30, 2018. Retrieved July 28, 2024.