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61

延長コード 1.5m

Launch it

A $6.5M/yr market growing +3.9% this quarter with returns at 0.4% — clears our launch bar.

Market size 99Growth 30Conversion 52Competition 86Returns 98Price range 0Avg price 0Brand share 43Review moat 47Quality gap 75

Market size

Incredible¥6.5M

¥6.5M/yr · 133K searches

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Competition

Great29%

top-5 click share — an open shelf

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good4.2%

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

Review moat

Okay1,813.86

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay79%

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

Growth

Okay+3.9%

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

Avg price

Bad¥1173.52

avg listing price — sweet spot $15–$100

Price range

Bad¥387.79–¥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 is a ¥6.5M/yr Amazon Japan market (133K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Jan–Dec. Verdict: Launch it — 61/100.

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

延長コード 1.5m market data

Units sold / yr
4K–5K
avg 0–100/product
Revenue / yr
¥4.7M–¥5.9M
units × avg price
Conversion rate
4.2%
Avg BSR
#112
Page quality
0%
Prime
91%
Sponsored
59%
Out of stock
3.6%
Avg brand age
54 months
Avg seller age
162 days

Competition & brand share

Clicks spread well past the top 5 (29% combined) — an open shelf where new products get seen.

Brands

16 flat

Sellers

128

Top-5 brand share

79%

Top 20: 100%

Top-5 click share

29%

Top 20: 73%

Open market

18%

  • エレコム(ELECOM)34%
  • オーム(OHM)24%
  • サンワサプライ(Sanwa Supply)12%
  • エルパ(ELPA)5%
  • uxcell4%
  • TOPREK3%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +3.9% search growth over the last 90 days.
5K3KSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Prime Day '26SepDecMarJunAugNovMarMay

Peak months: Jan, Dec · busiest ÷ quietest = 1.9×

Top 延長コード 1.5m search terms

  • 延長コード 1.5m57K/yr
  • 延長コード1.5m33K/yr
  • 電源タップ 1.5m22K/yr
  • えんちようこーど 1.5m8K/yr
  • 延長コード 1 .5m4K/yr
  • 延長コード 1.55K/yr
  • 延長コード 1.5m 3口4K/yr
All search terms

Top 延長コード 1.5m 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%3%¥196K6%¥392K9%¥589K12%¥785K1101001K10K100K 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 1.5m

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

What buyers love

使用の容易さ24%

“使える”

コストパフォーマンス12%

“お手頃価格”

総合品質9%

“リーズナブルで問題なし。”

デザイン全体6%

“アダプターの使用を考慮した設計”

充電6%

“スマホワイヤレス充電”

コネクタ/ポート/プラグ5%

“USBは楽に繋げます”

サイズ全体4%

“大型アダプターもスムーズに収まる”

コンパクトさ3%

“省スペースで良いです。”

セキュリティ3%

“サンワサプライならまぁ安心”

持ち運びやすさ3%

“新幹線でもシートポケットに収まるサイズ感で邪魔にならず、移動中の複数デバイス充電にも便利です。”

What buyers complain about

充電17%

“USB差し込み口から充電出来なくなった”

耐久性12%

“一カ月と1日で壊れた”

コネクタ/ポート/プラグ6%

“USB-Aポートのひとつが機能しなくなりました。”

サイズ全体5%

“サイズ小さめ”

総合品質4%

“良いか悪いかは分かりませんが”

加熱4%

“熱くなる”

使用の容易さ3%

“取り回しがしづらいのがややネックです。”

接続性 - 全体3%

“usbが通電して無い”

機能全体3%

“スイッチランプ. スイッチは点灯タイプではないです。”

厚み3%

“プラグ部分が薄くて使いやすい。”

Top return reasons

充電23%
サイズ全体14%
コネクタ/ポート/プラグ11%
不良材料/部品7%
6%
機能全体6%
互換性-全体6%
接続性 - 全体5%
広告と実際の製品の違い3%
加熱2%

Common questions

Is 延長コード 1.5m profitable to sell on Amazon Japan?
The niche generates ¥6.5M/yr across 56 tracked products. 4 of 5 products launched in the last 360 days are still selling. 90-day search growth is +3.9%. Flapen's verdict: Launch it (61/100).
How competitive is the 延長コード 1.5m niche?
16 brands and 128 sellers compete. The top 5 products take 29% of clicks and top 5 brands hold 79% of demand.
What do buyers complain about in 延長コード 1.5m?
Top complaints mined from reviews: 充電, 耐久性, コネクタ/ポート/プラグ. The return rate is 0.4%.
When does demand for 延長コード 1.5m peak?
Demand peaks in Jan–Dec; the busiest month runs 1.9× the quietest.
What does it cost to enter the 延長コード 1.5m niche?
Listings span ¥387.79–¥9255.99; the average listing price is ¥1173.52 (sweet spot $15–$100). The average incumbent carries 1,814 reviews — the moat a new listing must climb.