Ben Haim follows Steve Sidwell and Claudio Pizarro in moving to Stamford Bridge for nothing as Chelsea continue to bolster their squad ahead of next season.
But Ben Haim, who came close to signing for Chelsea in the January transfer window, opted to sign a four-year deal at Stamford Bridge instead.
Chelsea said in a statement: "We can confirm we have completed the signing of Tal Ben Haim.
"The Israel international, formerly at Bolton where he was out of contract, completed his medical and agreed personal terms today on a four-year deal.
"He becomes the third new addition to the first team squad following Claudio Pizarro's signing earlier this month and the agreement that Steven Sidwell will join on July 1."