Skip to content
44

tbv03401j1

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Market size 100Growth 22Conversion 48Competition 3Returns 98Price range 0Avg price 0Brand share 0Review moat 93Quality gap 58

Market size

Incredible¥20.8M

¥20.8M/yr · 30K searches

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Review moat

Great136

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Conversion

Okay3.8%

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

Growth

Bad-5.9%

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

Competition

Bad96%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Avg price

Bad¥18063.37

avg listing price — sweet spot $15–$100

Price range

Bad¥13430.48–¥25024.31

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

According to Flapen's Amazon Japan niche tracking, tbv03401j1 is a ¥20.8M/yr Amazon Japan market (30K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 44/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

tbv03401j1 market data

Units sold / yr
1K–2K
avg 100–250/product
Revenue / yr
¥22.6M–¥27.1M
units × avg price
Conversion rate
3.8%
Avg BSR
#89
Page quality
0%
Prime
67%
Sponsored
33%
Out of stock
10.5%
Avg brand age
43 months
Avg seller age
153 days

Competition & brand share

The top 5 products capture 96% of clicks — a locked-up shelf that new listings rarely crack.

Brands

3 rising

Sellers

49

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

96%

Top 20: 100%

Open market

0%

  • TOTO81%
  • ノーブランド品15%
  • Generic4%
  • Open — no brand owns it (0%)

Demand

Weekly Amazon search volume, last 40 weeks — -5.9% search growth over the last 90 days.
700500Holiday '25Spike '26Prime Day '26Oct '25Dec '25Jan '26Mar '26Apr '26May '26Jul '26

Top tbv03401j1 search terms

  • tbv03401j19K/yr
  • toto シャワー水栓6K/yr
  • tbv03401j6K/yr
  • tbv03401j1 toto5K/yr
  • toto tbv03401j15K/yr
All search terms

Top tbv03401j1 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%20%¥4.2M40%¥8.3M60%¥12.5M80%¥16.6M101001K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted

All 6 tracked products in this niche — three views at once, no toggling.

What buyers say about tbv03401j1

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

What buyers love

組み立て/インストール26%

“質感良い、 取付説明書も分かりやすく、スムーズに交換できました。”

コストパフォーマンス19%

“コスパも高い。お勧めです。”

使用の容易さ12%

“以前の物より水の切り替えレバーが軽く使いやすいです。”

快適さ-全体7%

“使って心地よい”

デザイン全体6%

“シンプルな良いデザイン”

漏れ防止6%

“水漏れもありませんでした。”

総合品質5%

“良い商品”

圧力4%

“水圧も得られて快適です。”

材料の品質3%

“TOTO商品なのでしっかりしていました。”

地元製造3%

“純正のTOTOは直接交換でき、一貫した日本品質です。”

What buyers complain about

漏れ防止22%

“以前使っていた物が水漏れしてたので今回取り替えました。”

メンテナンスと修理17%

“以前のが固着していたのか私が非力なのかびくともせずDIYでの交換ができなかったのだけは心残り・・・”

サイズ全体17%

“大きいのですが勢いが弱いです。”

ロック機構17%

“フランジが邪魔でシールテープが巻きづらいのが唯一の欠点”

総合品質8%

“質が違う”

Top return reasons

不良材料/部品28%
サイズ全体17%
広告と実際の製品の違い14%
互換性-全体11%
耐久性6%
使用説明書/ユーザーマニュアル/トラブルシューティング6%
メンテナンスと修理6%
デザイン全体6%
生锈/腐食する6%
追加アイテム/添付ファイル3%

Common questions

Is tbv03401j1 profitable to sell on Amazon Japan?
The niche generates ¥20.8M/yr across 6 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -5.9%. Flapen's verdict: Skip it (44/100).
How competitive is the tbv03401j1 niche?
3 brands and 49 sellers compete. The top 5 products take 96% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in tbv03401j1?
Top complaints mined from reviews: 漏れ防止, メンテナンスと修理, サイズ全体. The return rate is 0.3%.
What does it cost to enter the tbv03401j1 niche?
Listings span ¥13430.48–¥25024.31; the average listing price is ¥18063.37 (sweet spot $15–$100). The average incumbent carries 136 reviews — the moat a new listing must climb.