Details will be announced when Japan's Economy, Trade and Industry Minister Akira Amari visits New Delhi and Mumbai from June 30 through July 4, an official at his ministry said.

He will be joined by more than a dozen executives of big Japanese companies, led by Osamu Suzuki, chairman of Suzuki Motor Corp., a top player in India's burgeoning auto market.

"The investment plan is part of India's own project of constructing infrastructure so the precise figure for Japanese investment depends on India," the official said on condition of anonymity.

"But it will total in the billions of dollars."

Japan has been trying to build closer political relations with India, in part to counter frequent rifts with China, but Japan's trade with China far surpasses its investment in South Asia.

The investment plan follows up a general agreement signed in December between Japanese Prime Minister Shinzo Abe and his Indian counterpart Manmohan Singh on working together on a "Delhi-Mumbai Industrial Corridor."

The corridor plan would build a high-speed rail network between India's two largest cities and develop sea ports on the west coast, with infrastructure built along the route.