The 27-year-old moved to the south coast in 2010 and has been instrumental in the club’s rise through the divisions to their current exalted Premier League status.
“Once I heard the club wanted to give me a new deal, it was a pretty easy decision,” Arter told the Bournemouth club website.
“The team has been successful over the last few years and you want to be part of somewhere that is continually progressing.
“I just want to improve all the time and it’s nice to be part of a squad who are all trying to do that, too.”
Arter has made 239 appearances for the club, scoring 28 goals
Manager Eddie Howe said: “Harry has been such an important player for us over a long period of time.
“He is a real winner and has been at the heart of most of the good things that have happened on the pitch.
“He has been outstanding in terms of his conduct and attitude to the group and it’s great news that he has committed his future to the club.”