Nirupam had complained that the actor had barely attended the Parliament on three occasions in the last five years.
Dutt said the statement was highly defamatory and that Nirupam had misled the voters by doing so.
Dutt said that he had attended the 13th Lok Sabha 99 times, and he had documentary evidence to prove it.
Outside the court, Dutt and his lawyer Majeed Memon reiterated that Nirupam's statements were defamatory.
They also said that they had earlier issued a legal notice to Nirupam to modify his statement, but he refused to do so, forcing them to file a defamation suit.