Japan's Suzuki Motor Corp said it will build its fourth auto plant in India, boosting its output in one of the fastest growing car markets to 1.5 million units a year.

Suzuki, which controls about half the Indian car market through majority-owned unit Maruti Suzuki India Ltd, said the factory would start operations in 2013, with annual output capacity of 250,000 cars.

Suzuki, which first started production in India in 1983, is now building its third Indian plant, raising output there to 1.25 million units a year by 2012.

The fourth factory will increase annual output in India to 1.5 million units, more than half its global output forecast for 2010 of 2.68 million units.

Maruti Suzuki, India's leading car maker, posted a 24 percent rise in August sales for its best-ever month.

Shares of Suzuki gained 1.9 percent to 1,785 yen, outperforming a 0.9 percent rise at the benchmark Nikkei average.

(Reporting by Nobuhiro Kubo; Editing by Nathan Layne)