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| Dec. 22, 1947 | | Born in Tokushima. | |
| 1970 | | Begins career in graphic designing. | |
| Summer 1973 | | Tours the United States for 40 days; purchases his first 100 records which has become the basis for his massive black music record collection. | |
| 1974 | | Travels to Guam where he was inspired by the coconut trees. | |
| 1975 | | Converts his career to illustrations by guidance of Teruhiko Yumura. | |
| Jan. 1978 | | Turns into a freelance illustrator. | |
| 1979 | | Publishes picture book "A LONG VACATION".
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| 1981 | | Publishes picture book "HALATION".
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| 1982 | | Publishes "NIAGARA SONG BOOK"; develops his career in advertisment, publishing, record covers, calendars etc. | |
| Apr. 1992 - Jun. 1993 | | Radio DJ, TOKIMEC SOUL COAST, Tokyo FM | |
| 1993 | | Releases CD, URBAN COLOURS (music selection, cover & calendar illustration) | |
| 1997 | | Releases CD, SUMMER MADNESS (music selection, cover & calendar illustration) | |
| 1998 | | Releases CD-ROM, DIGITAL POP GALLERY - THE ART OF HIROSHI NAGAI. | |
| Jun.-July 1999 | | Exhibition, SUMMER MADNESS, Bunkamura Gallery Shibuya | |
| May 2000 | | Exhibition, SUMMER MADNESS, Sapporo | |
| August 2000 | | Exhibition, Hiroshi Nagai's Illustrations, Kyoto | |
| March 2002 | | Releases CD, breeze - AOR best selection (cover illustration)
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| July 2002 | | Releases CD, breeze SUMMER - AOR best selection (cover illustration)
Releases DVD, breeze presents Hiroshi Nagai's summer madness
 
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| December 2002 | | Releases CD, breeze FOR TWILIGHT LOVERS - AOR best selection (cover illustration)
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| March 2003 | | Releases CD, breeze SWEET - AOR best selection (cover illustration)
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| August 2003 | | Releases CD, breeze COOL SUMMER - AOR best selection (cover illustration)
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| January 2004 | | Releases CD, breeze - CROSSOVER best selection (cover illustration)
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| January 2004 | | Releases CD, Mellow The Best Of J-AOR (cover illustration)
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| March 2004 | | Releases CD, breeze CITY - AOR best selection (cover illustration)
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