Former Congress MLA CK Jayachandra Reddy alias CK Babu was injured in a bomb blast in Andhra Pradesh's Chittoor district on Monday.
A bomb, planted near a drainage canal, went off when Babu's vehicle was passing by, police said.
The attack took place when the former legislator was on his way to visit a temple.
Two of his gunmen, driver and an associate were also injured in the attack.
While the condition of the former MLA was said to be out of danger, the condition of the driver and one of his gunmen was serious, the police said.
The vehicle in which Babu was travelling was damaged in the blast.