noun
niche market
A specialized segment of a market, often with specific customer needs. Used in business and marketing contexts.
この会社はニッチ市場を狙って成功した。
This company succeeded by targeting a niche market.
隙間市場 is a more Japanese-native synonym, but ニッチ市場 is more common in modern business contexts.
From English 'niche market', adapted into Japanese as ニッチ市場.