noun
person living alone; single person; unmarried person
Refers to someone who lives by themselves, often with a nuance of being unmarried. Can be used in contexts like housing, demographics, or lifestyle.
このアパートは単身者向けです。
This apartment is for single occupants.
単身者の割合が増えている。
The proportion of people living alone is increasing.
一人暮らし is a common, everyday term for 'living alone', whereas 単身者 is a more formal noun often used in statistics or official contexts.
Compound of 単身 (たんしん, 'alone; by oneself') and 者 (しゃ, 'person').