Mitra, 63, emerged as a 'giant killer' by defeating CPI(M) veteran and state Finance Minister Asim Dasgupta by a big margin from the Khardah Assembly constituency.
His resignation has been accepted by the Ficci leadership, which said that it "wishes him all the very best for another historical role in the impending and hugely awaited economic transformation of West Bengal".
He submitted his resignation yesterday.
Mitra, a Phd in economics from Duke University in the US, has been at the helm of Ficci's affairs for over 16 years.
The former Secretary General is being seen as the next Finance Minister of the debt-ridden state.
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