The former railway minister, known for his organisational skills, joined the BJP in the presence of its chief Amit Shah.
Roy told reporters later that the BJP was not a communal but secular party.
Roy (63) recalled how the TMC forged an alliance with the BJP soon after Banerjee founded it and became a minister in the Atal Bihari Vajpayee government. He said the regional party could not have grown without the BJP's support.
Union minister Ravi Shankar Prasad told a press conference after Roy joined the party that he was a founder leader of the TMC leader who played a key role in its expansion and march to power in the state.
He also effectively fought excesses and atrocities of the previous CPI(M) governments, Prasad said, insisting that Roy expressed his desire to join the BJP unconditionally and the party welcomes him wholeheartedly.
"His role will be decided," BJP general secretary Kailash Vijayvargiya, who is the party's in-charge for the state, said.
The BJP will expand further in the state with Roy's indunction, Prasad said.
Asked about corruption allegations against him, Roy said the law will take its own course.
It will be his "proud privilege" to work under Prime Minister Narendra Modi and Shah, he said.
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