Ajit, nephew of NCP chief Sharad Pawar, took oath as deputy chief minister.
Fadnavis thanked Ajit, MLAs, and Independent legislators for their support.
"It is true that some friends are not with us anymore," he said apparently referring to the Shiv Sena, which fell out with the BJP after assembly poll results over its demand for a rotational chief ministership.
"Our commitment is to provide a strong government for the next five years. Our commitment is to the people of the state," Fadnavis said.
He thanked PM Modi, Union Home Minister and BJP chief Amit Shah and acting BJP president J P Nadda.
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