The four members are S T Nunglun Victor, Samuel Risom, V Alexender Pou and Dikho, said Manipur Assembly liason officer (press, media) R K Bhagat Singh.
They submitted their resignations separately to the Speaker through the Secretary of Manipur Assembly K Meghajit Singh, he said.
While three of them came to the Assembly in the afternoon and submitted their resignations to Meghajit Singh, Dikho sent it through them, Bhagat Singh said adding that none of them mentioned any reason.
With the resignation of the four MLAs, the strength of Manipur house would be reduced to 54 if the Speaker accepted their resignations.
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The four were present when the Assembly had passed the resolution welcoming the peace accord of the Centre with NSCN(IM) and on maintaining the territorial integrity of Manipur. While they had welcomed the accord, they did not agree to a portion of the resolution on the other.
The resolution was, however, passed by voice vote.
NPF is Nagaland-based and heads the DAN government in that state.