The owner should be responsible for the negligence of borrowing the car.
Lawyer Li Zhishan of Shaanxi Heheng Law Firm said that Article 49 of the Tort Liability Law of People's Republic of China (PRC) stipulates that if the owner and user of a motor vehicle are not the same person because of renting or borrowing it, if the motor vehicle is the responsibility of one party after a traffic accident, the insurance company shall make compensation within the limits of motor vehicle compulsory insurance liability. For the insufficient part, the motor vehicle user shall be liable for compensation; The owner of a motor vehicle shall be jointly and severally liable for damages.