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59

延長コード1m

Worth a look

Shows a $69.7M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 100Growth 25Conversion 76Competition 72Returns 98Price range 0Avg price 0Brand share 32Review moat 41Quality gap 63

Market size

Incredible¥69.7M

¥69.7M/yr · 894K searches

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Conversion

Great7.4%

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

Competition

Good42%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Okay2,418.53

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay86%

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

Growth

Bad-0.3%

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

Avg price

Bad¥1057.69

avg listing price — sweet spot $15–$100

Price range

Bad¥387.79–¥2701.68

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1m is a ¥69.7M/yr Amazon Japan market (894K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Dec. Verdict: Worth a look — 59/100.

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

延長コード1m market data

Units sold / yr
60K–80K
avg 1,000–1,250/product
Revenue / yr
¥63.5M–¥84.6M
units × avg price
Conversion rate
7.4%
Avg BSR
#33
Page quality
0%
Prime
98%
Sponsored
65%
Out of stock
1.0%
Avg brand age
47 months
Avg seller age
161 days

Competition & brand share

The top 5 products take 42% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 falling

Sellers

85

Top-5 brand share

86%

Top 20: 100%

Top-5 click share

42%

Top 20: 81%

Open market

11%

  • エレコム(ELECOM)34%
  • オーム(OHM)19%
  • サンワサプライ(Sanwa Supply)15%
  • エルパ(ELPA)13%
  • TESSAN5%
  • AKIRARI3%
  • Open — no brand owns it (5 brands, 11%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -0.3% search growth over the last 90 days.
30K20KSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Prime Day '26SepDecMarJunAugNovMarMay

Peak months: Dec · busiest ÷ quietest = 2.0×

Top 延長コード1m search terms

  • 延長コード1m434K/yr
  • えんちようこーど 1m152K/yr
  • 延長コード 1m78K/yr
  • 電源延長コード36K/yr
  • 延長コード 1500w以上18K/yr
  • 電源コード 3m16K/yr
  • 100v 延長コード13K/yr
  • 2m 延長コード15K/yr
  • 3m 延長コード16K/yr
  • 1m 延長コード14K/yr
All search terms

Top 延長コード1m 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%¥2.8M8%¥5.6M12%¥8.4M16%¥11.1M101001K10K100K 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 延長コード1m

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

What buyers love

使用の容易さ22%

“普通に使えます”

コストパフォーマンス15%

“お手頃価格”

総合品質10%

“良品です”

コネクタ/ポート/プラグ6%

“USB. コンセントあるので. でっぱり部分に置くのは便利です。”

充電5%

“スマホワイヤレス充電”

サイズ全体5%

“大型アダプターもスムーズに収まる”

セキュリティ4%

“安心安定のエレコム製。”

デザイン全体3%

“デザインも良い”

コンパクトさ3%

“省スペースで良いです。”

持ち運びやすさ3%

“旅行用”

What buyers complain about

充電16%

“1ヶ月半で充電できなくなった”

耐久性9%

“すぐ壊れた”

サイズ全体8%

“小さいですが”

総合品質6%

“同等品の中で安かった”

コストパフォーマンス6%

“ちょっと高いかな”

加熱5%

“すぐ熱くなるから不安しかない”

接続性 - 全体4%

“特にパソコン関係の接続が多い訳では無かったので、通常の延長コードを購入。”

コネクタ/ポート/プラグ4%

“USBポートが不安定すぎる”

厚み3%

“ケーブルは太く固め。”

広告と実際の製品の違い2%

“商品説明はちょっと優良誤認っぽいですね。”

Top return reasons

充電17%
サイズ全体15%
コネクタ/ポート/プラグ12%
不良材料/部品9%
互換性-全体9%
機能全体7%
接続性 - 全体5%
広告と実際の製品の違い4%
商品の状態3%
2%

Common questions

Is 延長コード1m profitable to sell on Amazon Japan?
The niche generates ¥69.7M/yr across 40 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -0.3%. Flapen's verdict: Worth a look (59/100).
How competitive is the 延長コード1m niche?
11 brands and 85 sellers compete. The top 5 products take 42% of clicks and top 5 brands hold 86% of demand.
What do buyers complain about in 延長コード1m?
Top complaints mined from reviews: 充電, 耐久性, サイズ全体. The return rate is 0.4%.
When does demand for 延長コード1m peak?
Demand peaks in Dec; the busiest month runs 2.0× the quietest.
What does it cost to enter the 延長コード1m niche?
Listings span ¥387.79–¥2701.68; the average listing price is ¥1057.69 (sweet spot $15–$100). The average incumbent carries 2,419 reviews — the moat a new listing must climb.