いい推しの日とは？2026年のキャンペーン一覧と参加方法まとめ

What changed

#いい推しの日 is filling timelines because November 4 is a Japanese wordplay date read as「いい推しの日」(Good Oshi Day) — a day for celebrating the idol, character, athlete, or other favorite you cheer for. NHK reports explainer coverage on the meaning and economic impact of 推し活 on November 3–4, 2026, and several brands are running hashtag campaigns asking fans to name their「推し」.

This topic was measured at a snapshot rate of 6,565.5 posts/hour over a 987-second window ending 2026-11-04T14:49:45Z, built from three stored observations. The latest stored snapshot volume was 9,000 posts. That figure is a measured snapshot rate, not a live rate, forecast, or unique-person count. The exact breakdown by fandom is not verified and is treated below as unconfirmed.

Observation time	Measured posts/hour	Snapshot volume
2026-11-04T14:49:45Z	6,565.5	9,000 posts

Why this topic may be moving

The most straightforward driver is the calendar itself. November 4 reads as「いい(11)おし(4)の日」, a pun-based celebration of one's favorite. NHK published a piece on the day and on 推し活's economic impact around November 3–4, 2026, which helps explain why the phrase is reaching people who were not already in a fandom.

The second driver is campaign activity. Verified participants in the search results include:

楽天ブックス（推し楽） — a staff Instagram campaign tied to「いい推しの日」, running 2026/11/4 10:00 to 2026/11/25 9:59.
超ときめき♡宣伝部 — covered by マイナビニュース for a campaign where listening to a favorite song 1,000 times leads to a meeting, turning listening counts into a visible 推し活 action.
しまじろう（Benesse） — covered by 中日新聞Web with「あやしくないよー！」in front of 吉本興業, a playful 推し活「出待ち」scene.
Marvel, Star Wars, and JRA — mentioned in the search brief as running hashtag campaigns inviting fans to name their 推し.

What this brief does not verify is how much of the 6,565.5 posts/hour is driven by any one of these campaigns, by organic fan posting, or by a specific fandom. NHK explains the day, each brand page explains its own rules, and single-brand roundups exist, but no verified source aggregates the campaigns into one comparison. Treat fandom-level attribution as an open question rather than a finding.

What the signal establishes is that the hashtag had real momentum on the afternoon of November 4, 2026, and that verified campaigns with different deadlines were running at the same time. What it does not establish is which campaign or community produced the volume.

Why it matters

For a reader arriving from a hashtag, the practical value is not the number — it is knowing what the day means, which campaigns are open, and where the deadlines differ. The verified campaigns do not share one closing date: 楽天ブックス closes 2026/11/25 9:59, and the brief notes other campaigns carry Nov 27 and Dec 19 deadlines without a single page comparing them.

For brands and community managers, the day is a working case study in how a wordplay anniversary, media explainers, and simultaneous campaigns compound in a short window. For observers, it is a reminder that a hashtag count alone cannot tell you whether a campaign worked.

How to join

Participation generally means posting or replying with the hashtag and naming your 推し. For 楽天ブックス, the verified route is the official Instagram campaign, with a post window from 2026/11/4 10:00 to 2026/11/25 9:59. Private rules, prize details, and application steps for each campaign vary, so confirm them on each campaign's own page before entering.

Examples of participation are visible in 中日新聞Web's report on しまじろう's 推し活 scene and in マイナビニュース's coverage of 超ときめき♡宣伝部's listening-based campaign. A simple post naming your 推し, with the campaign hashtag where one is required, is the lowest-friction way to take part.

What to watch next

Deadline spread: the 2026/11/25 9:59 close for 楽天ブックス versus Nov 27 and Dec 19 deadlines mentioned for other campaigns — a comparison page is still missing.
Listening-count campaigns: 超ときめき♡宣伝部's 1,000-play mechanic turns attention into a measurable action; watch whether other artists copy it.
Fandom mix: the 6,565.5 posts/hour figure is measured, but the split between K-pop, anime, horse racing, Marvel, and Star Wars is not verified. Track which sub-communities post next to test that gap.
Non-human 推し: しまじろう and 競走馬 show that 推し is not limited to actors and idols; expect characters and teams to feature more prominently.

Frequently asked questions

「いい推しの日」はいつ、どういう由来の記念日なのか？

11月4日で、11を「いい」、4を「し／よ」と読む語呂合わせから「いい推しの日」とされています。自分の好きなアイドル、キャラクター、アスリートなどを祝う日として扱われています。

今年はどんな企業・公式アカウントがキャンペーンをやっているのか？

検索結果で確認できたのは、楽天ブックス（推し楽）、超ときめき♡宣伝部、しまじろう（Benesse）、Marvel、Star Wars、JRAです。これ以外のキャンペーンが2026年に実施されているかは確認できていません。

楽天ブックスのキャンペーンは応募方法・期間・賞品がどうなっているのか？

楽天ブックス公式Instagramキャンペーンで、期間は2026/11/4 10:00から2026/11/25 9:59までです。応募方法と賞品の詳細は各キャンペーンページで確認してください。

ハッシュタグを付けて何を投稿すれば参加できるのか？

基本は「#いい推しの日」を付けて、自分の推しを投稿またはリプライで紹介する形です。キャンペーンごとに指定ハッシュタグや応募条件が異なるため、参加前に各公式ページのルールを確認してください。

推し活の市場規模や経済効果はどのくらいあるのか？

NHKが推し活の経済効果と産業創出への期待を報じていますが、具体的な市場規模の数値は今回の情報では確認できていません。数値を断定せず、NHKの解説記事を参照してください。

俳優・アイドル以外（アニメキャラ、競走馬、ヒーローなど）も「推し」として扱われるのか？

はい。しまじろう（中日新聞Web）や競走馬、MarvelやStar Warsのキャラクターなど、多様な対象が「推し」として扱われています。「推し」は人に限らない表現です。

Methodology and limitations

The 6,565.5 posts/hour figure was measured over an exact 987-second window ending 2026-11-04T14:49:45Z, using three stored observations from the same snapshot. The latest snapshot volume was 9,000 posts. The figure describes measured snapshot velocity; it is not a live rate, forecast, reach, engagement, or unique-person count.

Several things remain unconfirmed: the total number of posts using the hashtag, the exact fandom breakdown, whether いい推しの日 has an official anniversary body, market-size figures for 推し活, government-hosted regional event details, English-language Wikipedia coverage, and whether additional 2026 campaigns exist beyond those named here. Practical next checks: open each campaign's own page for rules and deadlines, compare the Nov 25, Nov 27, and Dec 19 dates, and sample posts across sub-communities to see which fandoms are actually posting.