thrifty person; saver; frugal person
Refers to a person who habitually saves money or resources, often with a positive connotation of being careful with spending.
He is a thrifty person and saves half of his monthly income.
My frugal mother always buys items on sale.
Compound of 節約 (setsuyaku, 'saving, economizing') and 家 (ka, 'person, specialist').