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6v acアダプター

Worth a look

Shows beatable incumbent ratings (3.9★), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 73Growth 19Conversion 49Competition 68Returns 87Price range 0Avg price 0Brand share 77Review moat 94Quality gap 96

Quality gap

Incredible3.9★

avg incumbent rating — lower means beatable quality

Review moat

Great125.08

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.4%

return rate — above 5% kills the launch gate

Brand share

Great58%

top-5 brand share — no brand owns this niche

Market size

Good¥810K

¥810K/yr · 20K searches

Competition

Good44%

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

Conversion

Okay4.0%

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

Growth

Bad-11.8%

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

Avg price

Bad¥1035.84

avg listing price — sweet spot $15–$100

Price range

Bad¥634.99–¥1638.24

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

According to Flapen's Amazon Japan niche tracking, 6v acアダプター is a ¥810K/yr Amazon Japan market (20K searches/yr). The top 5 brands hold 58% of demand. Verdict: Worth a look — 60/100.

Data updated Jul 31, 2026 · scored weekly · How we score niches

6v acアダプター market data

Units sold / yr
750–1K
avg 0–100/product
Revenue / yr
¥777K–¥1.0M
units × avg price
Conversion rate
4.0%
Avg BSR
#91
Page quality
0%
Prime
77%
Sponsored
73%
Out of stock
9.6%
Avg brand age
51 months
Avg seller age
176 days

Competition & brand share

The top 5 products take 44% of clicks — established leaders, but buyers still shop beyond them.

Brands

18 rising

Sellers

40

Top-5 brand share

58%

Top 20: 100%

Top-5 click share

44%

Top 20: 94%

Open market

36%

  • SUCCUL21%
  • ANLINK12%
  • Tyuusei10%
  • KOZATO8%
  • Kaito Denshi(海渡電子)7%
  • MianX7%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -11.8% search growth over the last 90 days.
500300Spike '24Holiday '24Spike '25Prime Day '25Spike '26Prime Day '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

Top 6v acアダプター search terms

  • acアダプター 6v6K/yr
  • dc6v アダプター3K/yr
  • 6v acアダプター4K/yr
  • 6v アダプター4K/yr
  • acアダプター 6v 1.5a3K/yr
All search terms

Top 6v acアダプター 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%3%¥24K6%¥49K9%¥73K12%¥97K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

What buyers say about 6v acアダプター

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

What buyers love

使用の容易さ25%

“使える用途が増えます。”

コストパフォーマンス17%

“ハイコストパフォーマンス”

総合品質9%

“良い商品です”

機能全体6%

“使えます”

互換性-全体4%

“オムロンの血圧計に使えています”

バッテリーの内蔵4%

“電池切れ心配なく使用できます。”

調整可能性/回転機能/リクライニング機能 3%

“調整しやすい”

コネクタ/ポート/プラグ3%

“LED端子プラグのおかげでリレーとアクチュエーター起動できた”

サイズ全体3%

“出力を考えればアダプタ本体の大きさも許容できます”

持ち運びやすさ3%

“端子も色々付いているので他のポータブル家電等にも流用出来るので一つあれば重宝します。”

What buyers complain about

充電17%

“充電器ではありませんでした”

サイズ全体15%

“重いトランス式の電源からぐっと小さくなりました”

耐久性11%

“3時間で壊れた”

接続性 - 全体10%

“マルチアダプタを使用せず接続可能。”

総合品質9%

“個体差かもしれませんが当たりが悪かったと諦めています”

測定/読み取り精度6%

“電圧の精度は、デジタルテスターで測ると若干ずれていますが、まあこんなもんでしょう。”

柔軟性5%

“まるで何年も使って硬化したケーブルみたい”

バッテリーの内蔵4%

“すぐに乾電池がなくなり、血圧計が使用出来なくなります”

互換性-全体3%

“期待外れ DVD Br に対応不可”

広告と実際の製品の違い3%

“実物は線長を記載の画像と説明文との差は無いが、全体写真よりは線径は細く・ACの線長は短いと感じます。”

Top return reasons

機能全体20%
サイズ全体20%
互換性-全体15%
充電14%
接続性 - 全体8%
不良材料/部品8%
広告と実際の製品の違い3%
使用の容易さ2%
商品の状態2%
加熱1%

Common questions

Is 6v acアダプター profitable to sell on Amazon Japan?
The niche generates ¥810K/yr across 26 tracked products. 90-day search growth is -11.8%. Flapen's verdict: Worth a look (60/100).
How competitive is the 6v acアダプター niche?
18 brands and 40 sellers compete. The top 5 products take 44% of clicks and top 5 brands hold 58% of demand.
What do buyers complain about in 6v acアダプター?
Top complaints mined from reviews: 充電, サイズ全体, 耐久性. The return rate is 1.4%.
When does demand for 6v acアダプター peak?
Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the 6v acアダプター niche?
Listings span ¥634.99–¥1638.24; the average listing price is ¥1035.84 (sweet spot $15–$100). The average incumbent carries 125 reviews — the moat a new listing must climb.