The sociology of law is often described as a sub-discipline of sociology

Sociology

Sociology is the study of society. It is a social science—a term with which it is sometimes synonymous—which uses various methods of empirical investigation and critical analysis to develop a body of knowledge about human social activity...

 or an interdisciplinary approach within legal studies. While some socio-legal scholars see the sociology of law as "necessarily" belonging to the discipline of sociology, others see it as a field of research caught up in the disciplinary tensions and competitions between the two established disciplines of law

Law

Law is a system of rules and guidelines which are enforced through social institutions to govern behavior, wherever possible. It shapes politics, economics and society in numerous ways and serves as a social mediator of relations between people. Contract law regulates everything from buying a bus...

 and sociology.