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Amazon Japan

¥180.9B/yr of tracked demand — 14,733 tracked niches across 4 categories on Amazon Japan (median 90-day growth +4.2%) — led by 熊笛 at 81/100.

Amazon Japan in one read

Everything a seller checks before picking a lane, in three answers.

How big is it?

A ¥180.9B/yr marketplace: 14,733 tracked niches across 4 categories. 53.2M Amazon searches last week.

¥180.9B

tracked market / yr

Niches tracked14,733
Categories tracked4
Searches last week+4.2%53.2M
Median niche market¥2.2M/yr

Where is it heading?

The median niche grew +4.2% in search demand over the last 90 days.

+4.2%

median 90-day growth

Rising categories3
Cooling categories1
Top riser+17.8%スポーツ&アウトドア

How open is it?

4,041 of 14,733 tracked niches clear our launch bar today. 2,083 run without a dominant brand.

4,041

launch-ready niches

No dominant brand2,083
Quality gap to exploit3,252
Low review barrier6,531
Trending right now1,502

Filters

Find your opening in Amazon Japan niches

Each filter is an opening a new seller can win. 1,502 Amazon Japan niches are trending right now, and one click opens every one that qualifies.

Market map

Every tracked category sized by yearly market — the marketplace at a glance.

ドラッグストア

¥84.0B3,383 niches

DIY・工具・ガーデン

¥40.3B4,191 niches

スポーツ&アウトドア

¥33.1B3,410 niches

おもちゃ

¥23.5B3,749 niches

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — median niche search growth of +4.2% over the last 90 days.

Volume53.2MMedian growth+4.2%Niches14,733Launch-ready4,041Categories4Market¥180.9B/yr
90.0M70.0MSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Prime Day '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

Categories

Every Japan category we track, ranked by yearly tracked market.

ドラッグストア

ドラッグストア

¥84.0B/yr

3,383 niches tracked

+2.2%
DIY・工具・ガーデン

DIY・工具・ガーデン

¥40.3B/yr

4,191 niches tracked

+2.8%
スポーツ&アウトドア

スポーツ&アウトドア

¥33.1B/yr

3,410 niches tracked

+17.8%
おもちゃ

おもちゃ

¥23.5B/yr

3,749 niches tracked

-2.6%

Niches

The marketplace four ways: who scores best, who sells most, who is gaining searches, and who just emerged.

Best Flapen score

熊笛
81

熊笛

¥5.5M/yr+260.5%

水鉄砲
80

水鉄砲

¥90.2M/yr+574.0%

熊鈴
79

熊鈴

¥91.3M/yr+342.9%

草刈り機 替え刃
79

草刈り機 替え刃

¥38.2M/yr+268.1%

スーパーボール
79

スーパーボール

¥33.6M/yr+208.7%

Biggest markets

トイレットペーパー
58

トイレットペーパー

¥2.3B/yr-26.9%

花粉症 薬
60

花粉症 薬

¥1.4B/yr-89.5%

ティッシュ
56

ティッシュ

¥1.2B/yr-25.8%

電動歯ブラシ
60

電動歯ブラシ

¥1.1B/yr+17.0%

メダリスト
54

メダリスト

¥916.9M/yr-81.0%

New

亀頭包皮炎
51

亀頭包皮炎

¥36.1M/yr+39.3%

ノーシンピュア
46

ノーシンピュア

¥2.6M/yr-11.2%

軟膏
51

軟膏

¥3.6M/yr+9.1%

粉瘤取り
48

粉瘤取り

¥17.4M/yr+41.7%

生理痛
46

生理痛

¥32.3M/yr-11.9%

Products

The marketplace's products three ways: who sells most, who is gaining clicks, and who just landed.

Common Amazon Japan questions

The questions sellers ask about the marketplace, answered from the same tracked metrics.

Amazon Japan is a ¥180.9B/yr tracked market across 14,733 niches in 4 categories. Flapen's verdicts: 4,041 launch-ready, 5,764 worth a look, 4,928 to skip — the opportunity sits in specific niches, not the marketplace as a whole.
Marketplace-wide search demand on Amazon Japan is steady year-round — the busiest month runs 1.4× the quietest.