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Together with the pro-constitutional revisionists, his coalition has gained a two-thirds majority of the 121-seat upper house.
According to Keith Henry, founder and representative director of Asia Strategy in Tokyo, the election underscores the Japanese people's belief that there are no realistic alternatives to Abenomics for beating inflation.
"But it also means that post-election, Abe is under renewed pressure to meet those expectations," Henry said.
"He will need to quickly show progress on needed domestic regulatory reforms, or the Japanese people -- and the financial markets -- could quickly lose patience."
Controversial issue
The result will also allow Abe to take a step forward toward constitutional amendments, a controversial issue that has divided the nation.
In Japan, war is banned. Since the end of World War II, Japan's constitution has renounced the threat or use of force. War as a means to settle international disputes is outlawed, according to Article 9 of the constitution.
The military can only be used for defensive purposes.
The rise of China's military and its expansionism in the South and East China Seas, together with North Korea's increasing belligerence, is helping Abe's push.
It's still a very sensitive subject in Japan, but attitudes could be changing. Exit polls on Sunday showed 49% of voters supported revising the constitution. Forty-four percent were against it.
The vote came just days before the United Nations rules on China's highly controversial territorial claims in the South China Sea.
That territory includes islands that Japan claims as its own.
"For the first time in Japan's post-war history, the Japanese people have given a prime minister a 'green light' to begin a debate in the national parliament on revising the constitution," Henry said.
"The national referendum required to approve whatever the Diet [national parliament] decides will allow the Japanese people to finally determine for themselves their own constitution."