purchasers; customer base; target market
Refers to the group of people who buy a particular product or service, often used in marketing contexts.
The main purchasers of this product are young women.
We want to expand our customer base with the new advertisement.
Compound of 購買 (こうばい, 'purchasing') and 層 (そう, 'stratum' or 'layer'), literally 'purchasing stratum'.