せどり

• 読み: せどり
• ローマ字: sedori
• 発音: /se.do.ɾi/

意味

Retail arbitrage; the practice of buying underpriced goods at stores and reselling them online for profit.

Originally a term from the used book trade, せどり has evolved into a side hustle where people scan barcodes at stores like BookOff, Hard Off, or clearance sales to find items they can resell on Amazon or Mercari at higher prices. It's a controversial practice — some see it as entrepreneurial, others view it as one step away from 転売ヤー behavior. There's a large ecosystem of せどり tutorials, tools, and communities online.

例文

1. せどりで月10万稼いでるって言うけど、経費と時間考えたら割に合うのかな。
2. ブックオフでせどりしてる人、店員に注意されてたよ。
3. せどりの情報商材に騙されて逆にお金失った話よく聞くよね。

使い方ガイド

場面: side hustle communities, social media, business

トーン: entrepreneurial, sometimes controversial

正しい言い方

• せどり始めたいけど、何から仕入れればいいか分からない。 (I want to start reselling but don't know what to source.)
• せどりって確定申告ちゃんとしないと脱税になるよ。 (If you don't properly file taxes on reselling income, it's tax evasion.)

避ける言い方

• 違法な転売を「せどり」と言い換えて正当化するのはNG — relabeling scalping as 'retail arbitrage' doesn't make it acceptable

よくある間違い

• Not understanding the difference between せどり (buying underpriced items) and 転売 (scalping limited items at markup)

起源と歴史

Originally from 背取り — the practice of buying rare books by checking the spine (背) without opening them, then reselling to collectors. Dates back to the used book trade but gained modern meaning in the 2010s with e-commerce and barcode scanning apps.

文化的背景

時代: Traditional book trade term, modern usage from 2010s

世代: 20s-40s, side hustle seekers

社会的背景: Various, popular as a side income stream

地域メモ: Used nationwide. BookOff and Hard Off chain stores are classic せどり hunting grounds.