PARIS, Jan 6 (Reuters) - French bank Societe Generale said its car leasing division ALD had agreed to buy the company LeasePlan for 4.9 billion euros ($5.5 billion), creating a new market leader in its area and boosting value for SocGen shareholders.

SocGen said the deal would result in a new, enlarged company with a total combined fleet of around 3.5 million vehicles, and would be an earnings accretive transaction.

"This proposed transaction is a major step for ALD and for the Societe Generale group. Over the past 10 years, thanks to long-term vision and rigorous execution, we have positioned ALD to take advantage of the tremendous growth potential in the sustainable mobility market," said SocGen CEO Frederic Oudea.

($1 = 0.8846 euros) (Reporting by Jean Terzian; Editing by Sudip Kar-Gupta)