The contract is expected to pay the right-hander $325 million, the richest deal for a pitcher in Major League Baseball. Excluding, of course, his new teammate Shohei Ohtani whose talent as a batter played a big role in his own massive 10-year, $700 million deal.
The Dodgers introduced Yamamoto to the public and the media on Wednesday at a Dodger Stadium press conference.
Yamamoto introduced himself to fans with a statement read in English.
"I am beyond ecstatic to become a member of this historic franchise," he said. "And cannot express how much it means to me to be able to call Los Angeles my new home."
He will wear jersey No. 18, the same number he wore in Japan and one which in his country signifies the ace of the pitching staff.
The team's offer to acquire Yamamoto includes a $50.6 million posting fee to his previous team, the Orix Buffaloes.
The 25-year-old Yamamoto has won three consecutive MVP awards and Sawamura Awards -- Nippon Professional Baseball's equivalent of the Cy Young.
The Dodgers came out on top of the bidding war for Yamamoto over the New York Yankees, New York Mets, Boston Red Sox, San Francisco Giants, Philadelphia Phillies and Toronto Blue Jays.
Yamamoto has been the most dominant pitcher in Japan over the last four years and statistically throughout the NPB's 74-year history. Over 820 1/3 innings, he has posted a 1.65 ERA, struck out nearly five times as many hitters as he walked and allowed one home run every 28 innings.
The signing of Ohtani and Yamamoto in the offseason - contract commitments totaling more than $1 billion - have made the Dodgers the odds-on favorites to win the 2024 World Series.
The two have already met in Los Angeles. Matsuhisa Beverly Hills posted a picture of them dining there together earlier this month.