For years, Japan has managed to resist the populist waves that have swept Europe and the United States as disaffected electorates have demanded radical change.

       But as voters handed the longtime governing party of Japan a resounding blow in snap parliamentary elections on Sunday, there were signs that their frustration could convert one of the region’s most stable democracies into a much more chaotic one.

       On the surface, it appeared that the center had held. Even though the Liberal Democratic Party, which has dominated Japanese politics for most of the postwar era, lost its majority in the lower house of Parliament, the Constitutional Democrats, who won the second-most seats behind the L.D.P., are another relatively centrist party.

       But minority parties on the far left and far right both gained seats. And while Shigeru Ishiba, who was selected by the Liberal Democrats as prime minister only a month ago, blamed the party’s dismal showing on a protracted political finance scandal, analysts said the sense of grievance among voters went far deeper.

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       “The last 30 years of stagnation and the deterioration of the living standards, especially for young people — the frustration is there,” said Kunihiko Miyake, a former Japanese diplomat who is now a special adviser at the Canon Institute for Global Studies in Tokyo.

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       Election results reflected voter discontent over flat wages, labor shortages and a rapidly aging population.Credit...Eugene Hoshiko/Associated Press

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