Dr.Thaworn Phornprapha founded Siam Motors Co., Ltd. on 4 September 1952 at 891/1, Rama I Road, Pathumwan, Bangkok, starting a trade of new and used vehicles. Later, the company was commissioned Nissan’s first overseas dealers. In 1962, Nissan’s first manufacturing plant in Thailand was established at Soi Srichan, Sukhumvit 67 under the name “Siam Motors and Nissan Co., Ltd.” with totally 120 employees and an initial production capacity of only four cars a day.

The company strongly flourished along with the consistent development of people and technology to meet international standard. With the company’s rapid growth, the factory was moved to a new site at Siam Motors Industrial Center on Bang Na–Trat (Kilometer 21) served as Nissan pick-up manufacturing plant for exportation.

So far, Siam Motors Group has consistently developed a myriad of world-class quality products to serve Thai customers in different aspects of daily life, well-known as leading brands, namely, Nissan, Komatsu machinery, Hitachi elevator and escalator, Daikin air-conditioner, Yamaha musical instrument, GS Battery, KYB shock up and other auto parts.