| Age | 55 |
| Birthday | 29 April, 1970 |
| Birthplace | Helsinki, Finland |
| Height | 6' ¼" (184 cm) |
| Eye Color | Brown - Light |
| Hair Color | Blonde |
| Zodiac Sign | Taurus |
| Nationality | Finnish |
| Occupation | Guitarist |
| Claim to Fame | Stratovarius |
Jari Kainulainen (also known as Jartsi, born April 29, 1970) is a Finnish bass guitarist. He is in particular known for having been the bass player of the power metal band Stratovarius from 1993 until 2005. Kainulainen is currently the bassist of Masterplan, having joined 2012.
