Abe's ruling Liberal Democratic Party is projected to win 253 to 300 seats, taking majority of the 465-seat lower house of parliament by itself, while its coalition partner the Komeito Party is expected to win 27 to 36 seats, said an exit poll by the Japanese public broadcaster NHK.
The Party of Hope led by Tokyo Governor Yuriko Koike and the Constitutional Democratic Party of Japan (CDPJ) are vying for the largest opposition, with the Party of Hope likely to win 38 to 59 seats and the CDPJ projected to win 44 to 67 seats, according to the NHK poll.
Meanwhile, multiple exit polls showed that pro-constitutional reform forces are set to secure over two thirds of the lower house seats, paving way for the prime minister to realize his long-term ambition of revising the postwar pacifist constitution.
According to the NHK poll, the four parties in favor of revising the constitution, the LDP, the Komeito Party, the Party of Hope and the Japan Innovation Party, are expected to win 326 to 392 seats, over 70 percent of the 465 lower house seats.
Voter turnout was 29.99 percent as of 6:00 p.m. local time (0900 GMT), down 4.99 percentage points from the previous lower house election in 2014, according to government data.