The deal replaces his existing one, which was due to expire in 2014.
Jagielka has been one of manager David Moyes major transfer successes, having arrived from Sheffield United in 2007 and won the club's player of the year award the following season despite sustaining a serious knee injury in the second half of the campaign.
"I'm really pleased," Jagielka said. "We had talks a while ago and I knew it would only be a case of getting it signed and sealed and you can tell by the smile on my face that I am absolutely delighted to commit my future to Everton.
"I had a little while left on my last one but it is obviously nice to get a new one.
"I can concentrate on the football and hopefully there are exciting times ahead for me and the club."
Source: PA
Source: PA