ロングセラー

ろんぐせらー
noun
long seller, perennial favorite
businesswork
1. long seller, perennial favorite
A product, especially a book, that continues to sell well over a long period of time. Wasei-eigo from English 'long' + 'seller'.
ロングセラー商品(しょうひん)だ。
It's a long-selling product.
この(ほん)発売(はつばい)から十年(じゅうねん)以上(いじょう)ロングセラーだ。
This book has been a long seller for over ten years since its release.
Without flashy advertising, it spread by word of mouth and became a long seller.

ロングセラー is wasei-eigo describing a product that maintains steady sales over many years. The term is most commonly used for books but also applies to food products, cosmetics, and other goods.

Common collocations

ロングセラー VS ベストセラー:
ベストセラー refers to a product that sells in large quantities in a short period, while ロングセラー emphasizes sustained sales over a long time. A product can be both.