noun
non-regular employee; non-permanent worker
Refers to workers who are not regular, full-time permanent employees, including part-timers, temps, and contract workers. Often contrasted with 正社員.
非正社員の割合が年々増えている。
The proportion of non-regular employees is increasing year by year.
彼は非正社員として働いている。
He works as a non-permanent employee.
Compound of 非 (non-) and 正社員 (regular employee).