The 24-year-old had also been considering an offer from Crystal Palace after mutually agreeing with Arsenal that he would benefit from playing regular first-team football.
But the Cherries succeeded in signing the midfielder, who hopes to revive his club and international career after missing out on Sam Allardyce's first England squad.
Hypervenom Phantom II black It was during a loan move to Bolton in 2010 that Wilshere established himself as a player of exceptional promise and after which he featured regularly for Arsenal and England.
He will now hope a spell on the south coast under Bournemouth boss Eddie Howe can produce similar results.
X 16+ Purechaos white Bournemouth chief executive Neill Blake said: "Jack is a fantastic addition to the club.
ACE 16+ PureControl black "He is a player that needs no introduction and one that, quite rightly, our supporters will be excited to see in a Bournemouth shirt.
"He will bring a wealth of international and Premier League experience, so we are delighted to be able to welcome a player of his calibre to the club."
superfly v black Sky Bet have released some Jack Wilshere specials after the midfielder's loan move from Arsenal to Bournemouth was completed.
superfly mercurial v black Wilshere can be backed at 3/1 to score on his debut for the Cherries and he's on offer at10/1 to score 10 or more goals in the Premier League this season.