The highest-selling singles in Japan are ranked in the Oricon Singles Chart, which in 1985 was published in what was then called Oricon Weekly 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.

Oricon Weekly Singles Chart

Issue dateSongArtist(s)Ref.January 7""Kyōko KoizumiJanuary 14January 21""Kōji KikkawaJanuary 28February 4February 11""Seiko MatsudaFebruary 18February 25"Yoisho!" (ヨイショッ!)Masahiko KondōMarch 4""The AlfeeMarch 11""Momoko KikuchiMarch 18"Mi Amore (Meu amor é...)"Akina NakamoriMarch 25April 1""The CheckersApril 8April 15April 22""Kyōko KoizumiApril 29May 6""Kōji KikkawaMay 13"Akaitori Nigeta"Akina NakamoriMay 20""Seiko MatsudaMay 27""Momoko KikuchiJune 3June 10""Yumi Matsutoya, Kazumasa Oda, June 17June 24""Naoko KawaiJuly 1"Sand Beige (Sabaku e)"Akina NakamoriJuly 8""Seiko MatsudaJuly 15""The CheckersJuly 22July 29August 5""Kyōko KoizumiAugust 12""Anzen ChitaiAugust 19August 26""Toshihiko TaharaSeptember 2"Kanashimi ni Sayonara"Anzen ChitaiSeptember 9September 16""Sonoko KawaiSeptember 23September 30""The CheckersOctober 7""Momoko KikuchiOctober 14October 21"Solitude"Akina NakamoriOctober 28""Akiko KobayashiNovember 4November 11""The CheckersNovember 18"Koi ni Ochite: Fall in Love"Akiko KobayashiNovember 25December 2""Kyōko KoizumiDecember 9"Koi ni Ochite: Fall in Love"Akiko KobayashiDecember 16December 23"Kamen Butōkai"ShonentaiDecember 30"Koi ni Ochite: Fall in Love"Akiko Kobayashi

See also 1985 in Japanese music

References Oricon No.1 Hits 500. Clubhouse (Japanese: クラブハウス). 1998. ISBN 9784906496129. vol 1 (1968~1985).