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 1979.
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 1 | "Chameleon Army" | Pink Lady | [1] |
| January 29 | "Champion " | Alice | |
| February 26 | "Hero (Hero ni Naru Toki, Sore wa Ima) " | Kai Band | |
| March 12 | "Young Man (Y.M.C.A.) " | Hideki Saijo | |
| April 16 | "Miserarete " | Judy Ongg | |
| June 18 | "Kimi no Asa " | Satoshi Kishida | |
| July 23 | "Omoide-zake " | Sachiko Kobayashi | |
| July 30 | "Kanpaku Sengen " | Masashi Sada | |
| October 8 | "Sexual Violet No. 1 " | Masahiro Kuwana | |
| October 29 | "Oyaji no Ichiban Nagai Hi " | Masashi Sada | |
| December 10 | "Ihōjin " | Sayuri Kume | |
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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