Up for grabs are 465 seats in the more powerful of Japan's two-chamber parliament.
Abe pledged his party's stable leadership as he sought voters' support, promising a tougher stance on North Korea, as well as social security reform to relieve burdens on younger generations in Japan's rapidly aging society.
"We should stay unwavering," Abe said. "It is the policies, rather than a boom or slogans, that can open the future."
Experts say Abe timed his call for an election when opposition parties were unprepared to solidify his grip within the party and extend his rule.
Abe's Liberal Democratic Party and its coalition partner, Komei, are expected to win a majority, though a surging new conservative group, the Party of Hope, led by Tokyo Gov. Yuriko Koike, and a liberal-leaning Constitutional Democratic Party are likely to take some seats away.
Constitutional Democratic Party leader Yukio Edano said Abe's nearly five years of pro-business policies have escalated Japan's social divide.
"We must regain decent lives," Edano said. "We are going to change politics into one that is based on the people's voices, not one that comes down from up above.
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