Japanese automakers are increasing production in Thailand as a way to deal with the strong yen and the growth of markets in emerging economies.
Thailand has attracted the auto industry by offering tax breaks to firms that make fuel-efficient cars.
Since March, Nissan's Thai operations have been making compact cars for sale in Japan and emerging economies.
Suzuki is building a plant in Thailand with an annual capacity of 100,000 units.
Mitsubishi Motors is preparing to build a plant in Thailand with an annual capacity of 200,000 units.
Suzuki and Mitsubishi plan for their Thai factories to start making compact cars positioned as world strategic models in 2012.
Toyota plans to expand production of its new Prius hybrid from Japan to Thailand by the end of this year.
Japanese automakers are likely to increase production in Thailand even further as doing so better enables them to meet growing demand in emerging economies and reduces the impact they feel from the strong yen.