Senior CPI(M) leader Shyamal Chakraborty died of Covid-19 at a hospital in Calcutta on Thursday, party sources said.
He was 76 years-old.
Chakraborty, the three-time transport minister of West Bengal from 1982 to 1996, was admitted to the hospital after he tested positive for Covid-19 on July 30.
The septuagenarian was also a two-time Rajya Sabha member and a veteran trade unionist.
"He died this afternoon. He was on ventilation for the last few days," a party leader said.
He is survived by his daughter Ushasi Chakraborty, an actor.
Chakraborty is the second notable politician from the state to die of Covid-19. Trinamool Congress MLA Tamonash Ghosh succumbed to the contagion in June.
On Wednesday, Bidhannagar Municipal Corporation councillor Subhash Bose also died of the disease.