He was 82.
He is survived by wife, two sons and one daughter.
Kaushal, who was two-time MP and four-time MLA, was admitted to the hospital for nearly a month and was suffering from sinus problem.
He died this evening and the funeral will take place tomorrow at his ancestral village Bhojakhedi in Baran district, according to a family member.
He was a minister in Rajasthan government from 1993-98. He also held the position of BJP State President.
Chief Minister Vasundhara Raje, BJP State President Ashok Parnami and other leaders condoled the death of Kaushal.