Shiv Sena MP Omraje Nimbalkar was injured when an unidentified man attacked him with a knife in Maharashtra's Osmanabad district on Wednesday, police said.
The accused fled soon after the incident and search was underway to nab him, they said.
The incident took place when Nimbalkar, who represents the Osmanabad Lok Sabha constituency, was addressing an election rally at Padoli Naigaon village in Kalamb taluka, located around 400 km from here.
During the rally, a man along with a group came close to Nimbalkar on the pretext of shaking hands with him, a police official said.
"While greeting the MP, the man attacked him with a knife and immediately fled. Nimbalkar got hurt on his hand but escaped a major injury because of his wrist watch," he said.
After the incident, Nimbalkar was taken to a hospital for treatment, he said, adding that doctors later allowed him to go as the injury was minor.
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An offence has been registered against the unidentified attacker and police have launched search for him, he said.
The Lok Sabha member's father Pawanraje Nimbalkar, who was a Congress leader, was shot dead in his car near Kalamboli on the Mumbai-Pune Expressway on June 3, 2006.
Former Lok Sabha MP Padamsinh Patil is the key accused in that case.