"I am very happy to have signed a new contract with Chelsea," Conte told the club website.
"We worked extremely hard in our first year to achieve something amazing, which I am very proud of. Now we must work even harder to stay at the top."
Conte originally inked a three-year deal on his appointment last summer, after leading Italy into the European Championships.
It is understood the new contract represents improved terms for the Italian, but is not an extension.
