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Japan opinion polls and polling history

This archive contains 67 published national party-support polls for Japan, covering 2026. Compare individual polls, pollsters and long-term trends, then check the linked source table.

— Election timing

Polling over time

Dots are individual polls. Lines show the selected trend when enabled.

78%
44%

Parties

Pollsters

Country party-vote polling chart An interactive chart of published political opinion polls by party and fieldwork date.
Loading long-term archive… Hover, focus, or tap a dot for details. Trendlines break across long polling gaps and election markers use exact dates.

Method & maintenance

Methodology

The headline average uses polls ending within 45 days of the latest fieldwork date. Polls are weighted by recency (a 30-day half-life) and the square root of sample size, which reduces the influence of unusually large polls. Missing sample sizes use a default of 1,000. The chart can also switch to a wider smoothing window when you want a calmer line.

Trendlines are descriptive, not forecasts. Missing values are left out rather than treated as zero. Polling error, house effects, turnout and electorate wins all mean that this is a snapshot—not a prediction of election day.

The browser loads public polling tables from MediaWiki, beginning with the newest election cycles, and caches them locally for seven days. A small checked snapshot is bundled with the site only as a fallback, so the page remains useful during a network or source outage.