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58

延長コード 1.5m 1口

Worth a look

Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 65Growth 48Conversion 59Competition 64Returns 98Price range 0Avg price 0Brand share 55Review moat 48Quality gap 77

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Market size

Good¥626K

¥626K/yr · 13K searches

Competition

Good46%

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

Conversion

Good5.1%

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

Brand share

Good72%

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

Growth

Okay+18.2%

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

Review moat

Okay1,706.93

avg incumbent reviews — the moat a new listing must climb

Avg price

Bad¥970.25

avg listing price — sweet spot $15–$100

Price range

Bad¥373.09–¥9255.99

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

According to Flapen's Amazon Japan niche tracking, 延長コード 1.5m 1口 is a ¥626K/yr Amazon Japan market (13K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in Jul–Dec. Verdict: Worth a look — 58/100.

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

延長コード 1.5m 1口 market data

Units sold / yr
750–1K
avg 0–100/product
Revenue / yr
¥728K–¥970K
units × avg price
Conversion rate
5.1%
Avg BSR
#86
Page quality
0%
Prime
70%
Sponsored
77%
Out of stock
3.0%
Avg brand age
59 months
Avg seller age
180 days

Competition & brand share

The top 5 products take 46% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 rising

Sellers

83

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

46%

Top 20: 91%

Open market

23%

  • サンワサプライ(Sanwa Supply)23%
  • エレコム(ELECOM)20%
  • AKIRARI12%
  • uxcell9%
  • KOZUMUWAN8%
  • オーム(OHM)5%

Demand & seasonality

Weekly Amazon search volume, last 95 weeks — +18.2% search growth over the last 90 days.
450350Holiday '24Spike '25Prime Day '25Black Friday '25Holiday '25Spike '26Prime Day '26DecMarJunAugNovMarMay

Peak months: Jul, Dec · busiest ÷ quietest = 1.7×

Top 延長コード 1.5m 1口 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%¥25K8%¥50K12%¥75K16%¥100K1101001K10K100K 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.

Trending

90-day click momentum

What buyers say about 延長コード 1.5m 1口

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

What buyers love

使用の容易さ23%

“普通に使えます”

コストパフォーマンス18%

“お値段以上です”

総合品質12%

“普通に良い製品です。”

サイズ全体8%

“サイズ良好”

強さ7%

“丈夫そう”

耐久性5%

“後は耐久性で元は取れると確信しています。”

セキュリティ5%

“エレコムの安心感とコスパがある”

コネクタ/ポート/プラグ3%

“一番のお気に入りは極性ありのプラグが使えることです”

柔軟性2%

“90度回転するので便利です”

材料の品質2%

“しっかりした作りの品です”

What buyers complain about

コストパフォーマンス18%

“ちょっと高いかな”

加熱14%

“可動式差し込み部の異常過熱で、”

総合品質11%

“安いけど普通に使えるので全く問題なし”

充電10%

“3回に一回は全く反応せず充電できません”

使用の容易さ8%

“狭いところでは使いづらい”

サイズ全体8%

“先端部が大きく、重く、配置しづらい場合がある”

耐久性7%

“1ヶ月そこそこで断線。 1ヶ月程で断線。”

コネクタ/ポート/プラグ7%

“プラグの先が曲がります”

ロープ/ワイヤーの絡まり2%

“断線してた. 星ゼロです。開梱してすぐ使用しましたが、まさかの充電できず。恐らくコンセントにさす四角い部分とコードあたりで断線しています。”

重い2%

“先端部が大きく、重く、配置しづらい場合がある”

Top return reasons

サイズ全体26%
互換性-全体11%
接続性 - 全体11%
重い9%
機能全体9%
コネクタ/ポート/プラグ8%
広告と実際の製品の違い4%
不良材料/部品4%
メカニズムの問題3%
総合品質3%

Common questions

Is 延長コード 1.5m 1口 profitable to sell on Amazon Japan?
The niche generates ¥626K/yr across 30 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +18.2%. Flapen's verdict: Worth a look (58/100).
How competitive is the 延長コード 1.5m 1口 niche?
16 brands and 83 sellers compete. The top 5 products take 46% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in 延長コード 1.5m 1口?
Top complaints mined from reviews: コストパフォーマンス, 加熱, 総合品質. The return rate is 0.4%.
When does demand for 延長コード 1.5m 1口 peak?
Demand peaks in Jul–Dec; the busiest month runs 1.7× the quietest.
What does it cost to enter the 延長コード 1.5m 1口 niche?
Listings span ¥373.09–¥9255.99; the average listing price is ¥970.25 (sweet spot $15–$100). The average incumbent carries 1,707 reviews — the moat a new listing must climb.