The Red Sox announced they signed Pearce to a one-year deal Friday.
Per Yahoo Sports' Jeff Passan, Pearce will make $6.25 million for the 2019 season.
Pearce made a strong impression on the Red Sox after being acquired in a trade with the Toronto Blue Jays last June. The 35-year-old boasted a strong .279/.394/.507 slash line with 16 extra-base hits in 136 at-bats over 50 games following the deal.
During Boston's postseason, Pearce became an invaluable piece of the lineup. He hit .289/.426/.658 in 13 games and had three of his four home runs during the World Series against the Los Angeles Dodgers.
The right-handed-hitting Pearce will likely serve in a platoon at first base with Mitch Moreland, who owns a .676 career OPS against left-handed pitchers.