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20w usb-c電源アダプタ apple 純正

Worth a look

Shows low returns (0.5%), but pricing outside the sweet spot ($735.91 avg) keeps it on the watch list.

Market size 70Growth 19Conversion 60Competition 50Returns 98Price range 0Avg price 0Brand share 76Review moat 51Quality gap 83

Returns

Incredible0.5%

return rate — above 5% kills the launch gate

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Brand share

Great59%

top-5 brand share — no brand owns this niche

Market size

Good¥730K

¥730K/yr · 19K searches

Conversion

Good5.2%

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

Review moat

Good1,447.12

avg incumbent reviews — the moat a new listing must climb

Competition

Okay55%

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

Growth

Bad-11.6%

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

Avg price

Bad¥735.91

avg listing price — sweet spot $15–$100

Price range

Bad¥186.46–¥1417.24

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

According to Flapen's Amazon Japan niche tracking, 20w usb-c電源アダプタ apple 純正 is a ¥730K/yr Amazon Japan market (19K searches/yr). The top 5 brands hold 59% of demand. Demand peaks in Jan–Feb–Mar–Oct–Nov–Dec. Verdict: Worth a look — 55/100.

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

20w usb-c電源アダプタ apple 純正 market data

Units sold / yr
500–750
avg 0–100/product
Revenue / yr
¥368K–¥552K
units × avg price
Conversion rate
5.2%
Avg BSR
#50
Page quality
0%
Prime
100%
Sponsored
65%
Out of stock
14.4%
Avg brand age
47 months
Avg seller age
176 days

Competition & brand share

The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 flat

Sellers

49

Top-5 brand share

59%

Top 20: 100%

Top-5 click share

55%

Top 20: 100%

Open market

33%

  • エルパ(ELPA)18%
  • Hootek14%
  • エレコム(ELECOM)11%
  • オーム(OHM)9%
  • TESSAN8%
  • MARSNET8%

Demand & seasonality

Weekly Amazon search volume, last 70 weeks — -11.6% search growth over the last 90 days.
500300Spike '25Black Friday '25Spike '26Prime Day '26AprMayJunJulAugSepOctNovDecJanFebMarAprMayJunJul

Peak months: Jan, Feb, Mar, Oct, Nov, Dec · busiest ÷ quietest = 3.7×

Top 20w usb-c電源アダプタ apple 純正 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%4%¥29K8%¥58K12%¥88K16%¥117K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 17 tracked products in this niche — three views at once, no toggling.

What buyers say about 20w usb-c電源アダプタ apple 純正

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

What buyers love

コストパフォーマンス26%

“リーズナブル”

充電21%

“おすすめ充電器”

使用の容易さ20%

“便利アイテム”

総合品質7%

“良質なお品物です。”

コンパクトさ4%

“コンパクトサイズ”

耐久性2%

“後は耐久性ですね。”

コネクタ/ポート/プラグ2%

“USB”

持ち運びやすさ2%

“小さくて持ち運びやすい”

広告と実際の製品の違い2%

“期待どおり”

サイズ全体2%

“サイズ感良し”

What buyers complain about

充電21%

“充電できなくなった”

加熱11%

“熱くなる”

耐久性10%

“3ヶ月で壊れました。”

総合品質7%

“品質管理に疑問”

コストパフォーマンス7%

“安い”

コネクタ/ポート/プラグ5%

“プラグが収納不可”

サイズ全体5%

“思っていたよりすごく小さいです。”

機能全体3%

“ぜんぜん電源入りませんので使えませんでした”

使用の容易さ2%

“重いものをつけてると抜けやすい。”

接続性 - 全体2%

“コンセントも外れやすい。”

Top return reasons

充電25%
サイズ全体24%
互換性-全体10%
接続性 - 全体7%
コネクタ/ポート/プラグ6%
不良材料/部品4%
加熱4%
機能全体3%
広告と実際の製品の違い3%
騒音レベル2%

Common questions

Is 20w usb-c電源アダプタ apple 純正 profitable to sell on Amazon Japan?
The niche generates ¥730K/yr across 17 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -11.6%. Flapen's verdict: Worth a look (55/100).
How competitive is the 20w usb-c電源アダプタ apple 純正 niche?
13 brands and 49 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 59% of demand.
What do buyers complain about in 20w usb-c電源アダプタ apple 純正?
Top complaints mined from reviews: 充電, 加熱, 耐久性. The return rate is 0.5%.
When does demand for 20w usb-c電源アダプタ apple 純正 peak?
Demand peaks in Jan–Feb–Mar–Oct–Nov–Dec; the busiest month runs 3.7× the quietest.
What does it cost to enter the 20w usb-c電源アダプタ apple 純正 niche?
Listings span ¥186.46–¥1417.24; the average listing price is ¥735.91 (sweet spot $15–$100). The average incumbent carries 1,447 reviews — the moat a new listing must climb.