“It is essential to resolve conflict and ensure access to basic services and opportunities for all people,” it said in a statement.
The multi-lateral lender said the crisis has dampened the government's reform programmes, supported by the ADB.
“Such issues seriously affect the country’s ongoing transition towards inclusive growth, poverty reduction, and stability,” it said.
ADB offered its help to efforts at reconciliation, rehabilitation and rebuilding in Rakhine and has offered emergency assistance.
More than 400,000 Muslim Rohingyas have fled across the border to Bangladesh following a counter-insurgency offensive by Myanmar's army in the wake of militant attacks on security forces.
The UN has described Myanmar's strategy as "ethnic cleansing".
Bangladesh was already home to 400,000 Rohingya refugees before insurgents attacked 30 police outposts and an army base in the western Rakhine state.
UN agencies said the number of new refugees may reach to a million by the end of the year if the situation remains unchanged.