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55

100v 延長コード

Worth a look

Shows low returns (0.4%), but pricing outside the sweet spot ($939.20 avg) keeps it on the watch list.

Market size 77Growth 27Conversion 33Competition 79Returns 98Price range 0Avg price 0Brand share 55Review moat 41Quality gap 65

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Competition

Great36%

top-5 click share — an open shelf

Market size

Great¥947K

¥947K/yr · 38K searches

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Brand share

Good72%

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

Review moat

Okay2,444.63

avg incumbent reviews — the moat a new listing must climb

Conversion

Okay2.6%

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

Growth

Okay+1.8%

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

Avg price

Bad¥939.20

avg listing price — sweet spot $15–$100

Price range

Bad¥372.86–¥2716.09

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

According to Flapen's Amazon Japan niche tracking, 100v 延長コード is a ¥947K/yr Amazon Japan market (38K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in Feb–Nov. Verdict: Worth a look — 55/100.

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

100v 延長コード market data

Units sold / yr
1K–2K
avg 0–100/product
Revenue / yr
¥1.2M–¥1.4M
units × avg price
Conversion rate
2.6%
Avg BSR
#33
Page quality
0%
Prime
85%
Sponsored
73%
Out of stock
1.2%
Avg brand age
49 months
Avg seller age
181 days

Competition & brand share

Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen.

Brands

17 falling

Sellers

87

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

36%

Top 20: 79%

Open market

23%

  • エレコム(ELECOM)28%
  • サンワサプライ(Sanwa Supply)20%
  • AKIRARI13%
  • オーム(OHM)6%
  • 宏和工業5%
  • KOTUBAME5%

Demand & seasonality

Weekly Amazon search volume, last 56 weeks — +1.8% search growth over the last 90 days.
2K1KSpike '25Black Friday '25Spike '26Prime Day '26JulAugSepOctNovDecJanFebMarAprMayJunJul

Peak months: Feb, Nov · busiest ÷ quietest = 1.7×

Top 100v 延長コード search terms

  • 100v 延長コード13K/yr
  • 電源延長ケーブル7K/yr
  • 電源ケーブル 延長7K/yr
  • 1500w 延長コード6K/yr
  • 延長プラグ6K/yr
All search terms

Top 100v 延長コード 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%¥38K8%¥76K12%¥114K16%¥151K1101001K10K100K 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 100v 延長コード

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

What buyers love

使用の容易さ27%

“普通に使えます”

コストパフォーマンス18%

“お手頃価格”

総合品質10%

“これで良い. 企業のエレコムの信頼.”

強さ5%

“丈夫そう”

サイズ全体5%

“ちょうどいい大きさ”

耐久性4%

“約1年使用していますが、特にトラブルもなく問題なく使えています。”

セキュリティ4%

“安心安全のエレコム”

コネクタ/ポート/プラグ3%

“プラグ部分が180度スイングするので、壁にピタッと沿う形で差し込めて、これまで諦めていたデッドスペースを完璧に活用できています。”

2%

“ちゃんとした黒”

充電2%

“スマホワイヤレス充電”

What buyers complain about

総合品質14%

“ゴミ”

耐久性8%

“1ヶ月そこそこで断線。 1ヶ月程で断線。”

サイズ全体8%

“とにかく小さく邪魔に成らない”

使用の容易さ5%

“とにかく外れやすい。”

コストパフォーマンス5%

“ちょっと高いかな”

厚み5%

“コードは標準の太さでヘッド部も他社スリムタイプより少し大きめ。”

重い4%

“重い”

接続性 - 全体4%

“三口の接続部が1ヶ月ほどでに接続不良(おそらく断線)になりました”

加熱4%

“可動式差し込み部の異常過熱で、”

柔軟性3%

“差込口硬めだけどちゃんと差せるし”

Top return reasons

サイズ全体16%
互換性-全体11%
広告と実際の製品の違い9%
充電7%
接続性 - 全体7%
6%
不良材料/部品6%
機能全体6%
コネクタ/ポート/プラグ3%
商品の状態3%

Common questions

Is 100v 延長コード profitable to sell on Amazon Japan?
The niche generates ¥947K/yr across 40 tracked products. 4 of 7 products launched in the last 360 days are still selling. 90-day search growth is +1.8%. Flapen's verdict: Worth a look (55/100).
How competitive is the 100v 延長コード niche?
17 brands and 87 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in 100v 延長コード?
Top complaints mined from reviews: 総合品質, 耐久性, サイズ全体. The return rate is 0.4%.
When does demand for 100v 延長コード peak?
Demand peaks in Feb–Nov; the busiest month runs 1.7× the quietest.
What does it cost to enter the 100v 延長コード niche?
Listings span ¥372.86–¥2716.09; the average listing price is ¥939.20 (sweet spot $15–$100). The average incumbent carries 2,445 reviews — the moat a new listing must climb.