The 28-year-old, who arrived at Outdated Trafford from Atletico Madrid for $23.5 million (£18.9 million) in June 2011, has made 367 appearances for the English Premier League membership.
Capped 40 occasions by Spain, De Gea received the Premier League title in 2013, and has triumphed within the FA Cup, League Cup and Europa League.
Though he has been linked with strikes away from the membership previously, De Gea says he nonetheless has “way more to realize” at United.
“Since I arrived right here, I may by no means have imagined I’d play over 350 video games for this membership. Now my future is fastened, all I need is to assist this crew obtain what I consider we are able to and win trophies once more, collectively.
“As one of many senior gamers within the squad, I need to help and lead in any manner that I can to help the youthful gamers, in order that they know what it means to play right here. I nonetheless really feel that I’ve a lot extra to realize on the membership and I actually consider that Manchester United can construct on the membership’s custom of success and reward our followers for his or her help.
“I’m dedicated to proceed repaying the followers for the entire care that they’ve proven me through the good occasions and the dangerous.”
De Gea has performed in all 5 of United’s league video games to this point this season, together with Saturday’s 1-Zero win over Leicester which lifted it to fourth within the Premier League, seven factors behind chief Liverpool.
“I’m delighted that David has dedicated his long-term future to the membership,” he mentioned.
“Over current years, David has proved himself to be the perfect on the planet and an important a part of our plans as we glance to take Manchester United again to the place it belongs. David is a implausible particular person and his excellent high quality offers the right base to our protection.
“Over his time right here, David has actually understood the values of enjoying for Manchester United and now represents all the pieces you need in a goalkeeper.
“As a participant he’s nonetheless massively decided and hungry to realize extra. All of us stay up for working collectively to fulfill these ambitions over the approaching years.”