The highest-selling singles in Japan are ranked in the Oricon Singles Chart, which is published by Oricon Style magazine. The data are compiled by Oricon based on each singles' physical sales. This list includes the singles that reached the number one place on that chart in 1985.
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 7 | "The Stardust Memory " | Kyōko Koizumi | [1] |
| January 14 | |||
| January 21 | "You Gotta Chance: Dance de Natsu wo Dakishimete " | Kōji Kikkawa | |
| January 28 | |||
| February 4 | |||
| February 11 | "Tenshi no Wink " | Seiko Matsuda | |
| February 18 | |||
| February 25 | "Yoisho!" (ヨイショッ!) | Masahiko Kondō | |
| March 4 | "Cinderella wa Nemurenai " | The Alfee | |
| March 11 | "Sotsugyō: Graduation " | Momoko Kikuchi | |
| March 18 | "Mi Amore (Meu amor é...)" | Akina Nakamori | |
| March 25 | |||
| April 1 | "Ano Ko to Scandal " | The Checkers | |
| April 8 | |||
| April 15 | |||
| April 22 | "Tokonatsu Musume " | Kyōko Koizumi | |
| April 29 | |||
| May 6 | "Nikumare Sōna New Face " | Kōji Kikkawa | |
| May 13 | "Akaitori Nigeta" | Akina Nakamori | |
| May 20 | "Boy no Kisetsu " | Seiko Matsuda | |
| May 27 | "Boy no Theme " | Momoko Kikuchi | |
| June 3 | |||
| June 10 | "Ima Dakara " | Yumi Matsutoya, Kazumasa Oda, Kazuo Zaitsu | |
| June 17 | |||
| June 24 | "Debut / Manhattan Joke " | Naoko Kawai | |
| July 1 | "Sand Beige (Sabaku e)" | Akina Nakamori | |
| July 8 | "Dancing Shoes " | Seiko Matsuda | |
| July 15 | "Ore-tachi no Rockabilly Night " | The Checkers | |
| July 22 | |||
| July 29 | |||
| August 5 | "Majo " | Kyōko Koizumi | |
| August 12 | "Kanashimi ni Sayonara " | Anzen Chitai | |
| August 19 | |||
| August 26 | "Kareinaru Kake " | Toshihiko Tahara | |
| September 2 | "Kanashimi ni Sayonara" | Anzen Chitai | |
| September 9 | |||
| September 16 | "Namida no Jasmine Love " | Sonoko Kawai | |
| September 23 | |||
| September 30 | "Heart of Rainbow: Ai no Niji wo Watatte / Blue Pacific " | The Checkers | |
| October 7 | "Mō Aenai Kamo Shirenai " | Momoko Kikuchi | |
| October 14 | |||
| October 21 | "Solitude" | Akina Nakamori | |
| October 28 | "Koi ni Ochite: Fall in Love " | Akiko Kobayashi | |
| November 4 | |||
| November 11 | "Kami-sama Help! " | The Checkers | |
| November 18 | "Koi ni Ochite: Fall in Love" | Akiko Kobayashi | |
| November 25 | |||
| December 2 | "Nantettatte Idol " | Kyōko Koizumi | |
| December 9 | "Koi ni Ochite: Fall in Love" | Akiko Kobayashi | |
| December 16 | |||
| December 23 | "Kamen Butōkai" | Shonentai | |
| December 30 | "Koi ni Ochite: Fall in Love" | Akiko Kobayashi |
Toshinobu "Toshi" Kubota is a Japanese singer, songwriter, musician, music producer, and radio personality. He has produced six million-seller records and thirty-three Top 40 singles during his career. Kubota is currently part of Sony Music Japan. In addition, he has composed and written songs for many singers including Hiromi Iwasaki, Misia, Toshinori Yonekura, Kyōko Koizumi, and many other recording artists.
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