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58

延長コード 7m

Launch it

A $10.3M/yr market growing +7.1% this quarter with returns at 0.6% — clears our launch bar.

Market size 100Growth 34Conversion 56Competition 56Returns 97Price range 0Avg price 0Brand share 48Review moat 42Quality gap 73

Market size

Incredible¥10.3M

¥10.3M/yr · 110K searches

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good4.8%

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

Competition

Good51%

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

Brand share

Okay76%

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

Review moat

Okay2,255.38

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+7.1%

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

Avg price

Bad¥1960.90

avg listing price — sweet spot $15–$100

Price range

Bad¥635.64–¥4168.64

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 7m is a ¥10.3M/yr Amazon Japan market (110K searches/yr). The top 5 brands hold 76% of demand. Verdict: Launch it — 58/100.

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

延長コード 7m market data

Units sold / yr
4K–5K
avg 100–250/product
Revenue / yr
¥7.8M–¥9.8M
units × avg price
Conversion rate
4.8%
Avg BSR
#60
Page quality
0%
Prime
100%
Sponsored
69%
Out of stock
0.0%
Avg brand age
54 months
Avg seller age
168 days

Competition & brand share

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 falling

Sellers

128

Top-5 brand share

76%

Top 20: 100%

Top-5 click share

51%

Top 20: 87%

Open market

24%

  • サンワサプライ(Sanwa Supply)45%
  • エレコム(ELECOM)7%
  • オーム(OHM)6%
  • ANPEI-ELEC6%
  • トラスコ中山(TRUSCO)6%
  • Amazonベーシック(Amazon Basics)6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +7.1% search growth over the last 90 days.
4K3KSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Prime Day '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

Top 延長コード 7m search terms

  • 延長コード 7m36K/yr
  • 延長コード 6m31K/yr
  • 延長コード 8m19K/yr
  • 電源タップ 7m11K/yr
  • 電源タップ 6m6K/yr
  • 電源タップ 8m4K/yr
  • 延長ケーブル 7m3K/yr
All search terms

Top 延長コード 7m 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%5%¥513K10%¥1.0M15%¥1.5M20%¥2.1M101001K10K100K 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 7m

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

What buyers love

使用の容易さ22%

“問題なく使えます”

コネクタ/ポート/プラグ11%

“USB-Aも含めてポート数があるので、充電器をいくつも持ち歩かなくて済むのは助かります。”

コストパフォーマンス11%

“低価格”

デザイン全体9%

“デザインはシンプルで好印象です。”

充電7%

“あくまでスマホの夜間充電などのおまけ程度として割り切って使っています。”

サイズ全体6%

“大型アダプターもスムーズに収まる”

総合品質6%

“品質も良さそうで問題なく使えてます。”

持ち運びやすさ4%

“デスク上の万能選手”

セキュリティ3%

“安心安定のAmazonベーシック。”

強さ3%

“コンセントの保持力も優秀”

What buyers complain about

厚み13%

“ケーブルは太く固め。”

サイズ全体11%

“あとはサイズは大きめなので、置く場所が確保できるなら。”

総合品質8%

“ゴミ”

コネクタ/ポート/プラグ5%

“最近一部のコンセント口が通電しなくなりました。”

充電5%

“一部通電しなくなってきた”

強さ4%

“壊れやすい”

耐久性4%

“確かに壊れます”

不良材料/部品4%

“数回使用したら使用機器の電源オフが頻繁に発生、使えない製品。”

柔軟性2%

“曲がり癖を取るのに苦労しました。”

使用の容易さ2%

“取り回しがしづらいのがややネックです。”

Top return reasons

サイズ全体26%
コネクタ/ポート/プラグ14%
機能全体12%
互換性-全体9%
不良材料/部品9%
接続性 - 全体5%
可燃性4%
測定/読み取り精度3%
充電3%
漏れ防止1%

Common questions

Is 延長コード 7m profitable to sell on Amazon Japan?
The niche generates ¥10.3M/yr across 32 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +7.1%. Flapen's verdict: Launch it (58/100).
How competitive is the 延長コード 7m niche?
14 brands and 128 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 76% of demand.
What do buyers complain about in 延長コード 7m?
Top complaints mined from reviews: 厚み, サイズ全体, 総合品質. The return rate is 0.6%.
When does demand for 延長コード 7m peak?
Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the 延長コード 7m niche?
Listings span ¥635.64–¥4168.64; the average listing price is ¥1960.90 (sweet spot $15–$100). The average incumbent carries 2,255 reviews — the moat a new listing must climb.