niche market
noun [ C ] uk/ˈniːʃ ˌmɑː.kɪt/ us/ˈnɪtʃ ˌmɑːr.kɪt/
（常指专业产品的）市场一隅
a small area of trade within the economy, often involving specialized products
Lotus make luxury cars for a small but significant niche market. 莲花汽车公司为数量虽小但却重要的客户群体生产豪华轿车。