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換気扇 25cm

Launch it

A $10.9M/yr market growing +20.9% this quarter with returns at 0.6% — clears our launch bar.

Market size 100Growth 51Conversion 31Competition 41Returns 97Price range 0Avg price 0Brand share 30Review moat 91Quality gap 85

Market size

Incredible¥10.9M

¥10.9M/yr · 74K searches

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Review moat

Great180.65

avg incumbent reviews — the moat a new listing must climb

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Growth

Good+20.9%

90-day search growth — must beat 0% to launch

Competition

Okay61%

top-5 click share — leaders hold, buyers still browse

Conversion

Okay2.5%

search→purchase rate — share of searches ending in a sale

Brand share

Okay87%

top-5 brand share — brands hold most of the demand

Avg price

Bad¥6022.54

avg listing price — sweet spot $15–$100

Price range

Bad¥2660.31–¥11543.97

cheapest to priciest tracked listing — scored on the share inside $15–$100

According to Flapen's Amazon Japan niche tracking, 換気扇 25cm is a ¥10.9M/yr Amazon Japan market (74K searches/yr). The top 5 brands hold 87% of demand. Verdict: Launch it — 58/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

換気扇 25cm market data

Units sold / yr
2K–3K
avg 0–100/product
Revenue / yr
¥12.0M–¥15.1M
units × avg price
Conversion rate
2.5%
Avg BSR
#154
Page quality
0%
Prime
65%
Sponsored
60%
Out of stock
8.4%
Avg brand age
49 months
Avg seller age
158 days

Competition & brand share

The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 falling

Sellers

82

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

61%

Top 20: 100%

Open market

10%

  • 高須産業(Takasu Sangyo)33%
  • パナソニック(Panasonic)24%
  • YUASA PRIMUS11%
  • オーム(OHM)10%
  • Umillion9%
  • 三菱電機(MITSUBISHI ELECTRIC)3%
  • Open — no brand owns it (5 brands, 10%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +20.9% search growth over the last 90 days.
2K2KHoliday '24Spike '25Prime Day '25Holiday '25Prime Day '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.5×

Top 換気扇 25cm search terms

  • 換気扇 25cm67K/yr
  • 25cm 換気扇4K/yr
  • 25cm換気扇3K/yr
All search terms

Top 換気扇 25cm products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%¥1.1M20%¥2.2M30%¥3.3M40%¥4.4M1101001K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 20 tracked products in this niche — three views at once, no toggling.

What buyers say about 換気扇 25cm

What buyers praise and complain about, mined from review topics.

What buyers love

騒音レベル22%

“静かです”

組み立て/インストール21%

“取り付けも簡単です”

コストパフォーマンス21%

“リーズナブル”

総合品質9%

“金属筐体ですが、正面から見える四角い面の仕上げは良く室内に設置するのに十分なクオリティです。”

使用の容易さ5%

“お手入れがしやすそうです。”

効率4%

“正常動作中でしたが、Youtubeの動画より交換を決意...”

サイズ全体3%

“サイズが、バッチリです”

機能全体2%

“使用してみると風量は思ったより弱くなく、普通に使えます。”

軽い1%

“小型で軽量”

耐久性1%

“長く使える”

What buyers complain about

騒音レベル16%

“ただちょっと風音は高めだね。”

耐久性16%

“毎日8時間使用2年半で壊れました。”

サイズ全体14%

“サイズを確認. 商品は良い. ですが、サイズを間違えて使えなかった。残念です”

総合品質8%

“ゴミです。”

材料の品質6%

“プラスチック”

使用説明書/ユーザーマニュアル/トラブルシューティング5%

“取説簡素すぎる”

互換性-全体4%

“3p2p、3pからしか間に合わない!”

追加アイテム/添付ファイル4%

“本体、始動状態等は問題無かったのですが、付属品の「ON. OFF用の引き紐」が付いておりませんでした。”

生锈/腐食する4%

“既存はシャッターのスプリングが腐食で切れてSwitchが戻らなくて周りっぱなしだったけど、今回のものは多分ステンレスのスプリングの様に見えるので、樹脂シャッターの耐久性だけが気になる”

厚み2%

“作りが粗く(ファンにバリ有り)厚みが薄い(軽い)です。”

Top return reasons

サイズ全体77%
広告と実際の製品の違い4%
機能全体4%
互換性-全体4%
組み立て/インストール4%
不良材料/部品3%
メカニズムの問題2%
総合品質1%
メンテナンスと修理1%
フィルター1%

Common questions

Is 換気扇 25cm profitable to sell on Amazon Japan?
The niche generates ¥10.9M/yr across 20 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is +20.9%. Flapen's verdict: Launch it (58/100).
How competitive is the 換気扇 25cm niche?
11 brands and 82 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 87% of demand.
What do buyers complain about in 換気扇 25cm?
Top complaints mined from reviews: 騒音レベル, 耐久性, サイズ全体. The return rate is 0.6%.
When does demand for 換気扇 25cm peak?
Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the 換気扇 25cm niche?
Listings span ¥2660.31–¥11543.97; the average listing price is ¥6022.54 (sweet spot $15–$100). The average incumbent carries 181 reviews — the moat a new listing must climb.