Is it legal for the contractor working on the construction site to ask migrant workers to buy insurance themselves?

Social security is compulsory insurance, including endowment insurance, medical insurance, unemployment insurance, work injury insurance and maternity insurance.

Among them, pension insurance, medical insurance and unemployment insurance are jointly paid by the unit and employees. Work injury insurance and maternity insurance are paid in full by the unit.

It is legal and reasonable for the company to require employees to pay personal expenses, but it is illegal to require employees to bear the insurance expenses in full.