Mitsubishi Motors Corporation (Mitsubishi Jido-sha Ko-gyo- Kabushiki Kaisha?) is the sixth largest automaker in Japan and the seventeenth largest in the world by global unit sales. It is part of the Mitsubishi keiretsu, formerly the biggest industrial group in Japan, and was formed in 1970 from the automotive division of Mitsubishi Heavy Industries.
Throughout its history it has courted alliances with foreign partners, a strategy pioneered by their first president Tomio Kubo to encourage expansion, and continued by his successors. A significant stake was sold to Chrysler Corporation in 1971 which it held for 22 years, while DaimlerChrysler was a controlling shareholder between 2000 and 2005. Long term joint manufacturing and technology licencing deals with the Hyundai Motor Company in South Korea and Proton in Malaysia were also forged, while in Europe the company co-owned the largest automobile manufacturing plant in the Netherlands with Volvo for ten years in the 1990s, before taking sole ownership in 2001.

Thanks to these alliances it benefitted strongly in the 1970s and '80s, increasing its annual production from 250,000 to over 1.5 million units. But its strong presence in south-east Asia meant it suffered more than most of its competitors in the aftermath of the 1997 East Asian financial crisis, and since then the company has struggled to consistently increase sales and maintain profitability.
The logo of three red diamonds, shared with over forty other companies within the keiretsu, predates Mitsubishi Motors itself by almost a century. It was chosen by Yataro Iwasaki, the founder of Mitsubishi, as it was suggestive of the emblem of the Tosa Clan who first employed him, and because his own family crest was three rhombuses stacked atop each other. The name Mitsubishi is a portmanteau of mitsu ("three") and hishi (literally, "water chestnut", often used in Japanese to denote a diamond or rhombus).

Mitsubishi's automotive origins date back as far as 1917, when the Mitsubishi Shipbuilding Co., Ltd. introduced the Model A, Japan's first series-production automobile. An entirely hand-built seven-seater sedan based on the Fiat Tipo 3, it proved expensive compared to its American and European mass-produced rivals, and was discontinued in 1921 after only 22 had been built.

In 1934, Mitsubishi Shipbuilding was merged with the Mitsubishi Aircraft Co., a company established in 1920 to manufacture aircraft engines. The unified company was known as Mitsubishi Heavy Industries (MHI), and was the largest private company in Japan. MHI concentrated on manufacturing aircraft, ships, railroad cars and machinery, but in 1937 developed the PX33, a prototype sedan for military use. It was the first Japanese-built passenger car with full-time four-wheel drive, a technology the company would return to almost fifty years later in its quest for motorsport and sales success.

Immediately following the end of the Second World War, the company returned to manufacturing vehicles. Fuso bus production resumed, while a small three-wheeled cargo vehicle called the Mizushima and a scooter called the Silver Pigeon were also developed. However, the zaibatsu (Japan's family-controlled industrial conglomerates) were ordered to be dismantled by the Allied powers in 1950, and Mitsubishi Heavy Industries was split into three regional companies, each with an involvement in motor vehicle development: West Japan Heavy-Industries, Central Japan Heavy-Industries, and East Japan Heavy-Industries.

East Japan Heavy-Industries began importing the Henry J, an inexpensive American sedan built by Kaiser Motors, in knockdown kit (CKD) form in 1951, and continued to bring them to Japan for the remainder of the car's three year production run. The same year, Central Japan Heavy-Industries concluded a similar contract with Willys (now owned by Kaiser) for CKD-assembled Jeep CJ-3Bs. This deal proved more durable, with licensed Mitsubishi Jeeps in production until 1998, thirty years after Willys themselves had replaced the model.

By the beginning of the 1960s Japan's economy was gearing up; wages were rising and the idea of family motoring was taking off. Central Japan Heavy-Industries, now known as Shin Mitsubishi Heavy-Industries, had already re-established an automotive department in its headquarters in 1953. Now it was ready to introduce the Mitsubishi 500, a mass market sedan, to meet the new demand from consumers. It followed this in 1962 with the Minica kei car and the Colt 1000, the first of its Colt line of family cars, in 1963.

West Japan Heavy-Industries (now renamed Mitsubishi Shipbuilding & Engineering) and East Japan Heavy-Industries (now Mitsubishi Nihon Heavy-Industries) had also expanded their automotive departments in the 1950s, and the three were re-integrated as Mitsubishi Heavy Industries in 1964. Within three years its output was over 75,000 vehicles annually. Following the successful introduction of the first Galant in 1969 and similar growth with its commercial vehicle division, it was decided that the company should create a single operation to focus on the automotive industry. Mitsubishi Motors Corporation (MMC) was formed on April 22, 1970 as a wholly owned subsidiary of MHI under the leadership of Tomio Kubo, a successful engineer from the aircraft division.

Part of Kubo's expansion strategy was to increase exports by forging alliances with well-established foreign companies. Therefore, in 1971 MHI sold U.S. automotive giant Chrysler a 15 percent share in the new company. Thanks to this deal, Chrysler began selling rebadged Galants in the United States as Dodge Colts, pushing MMC's annual production beyond 250,000 vehicles.

By 1977, a network of "Colt"-branded distribution and sales dealerships had been established across Europe, as Mitsubishi sought to begin selling vehicles directly. Annual production had by now grown from 500,000 vehicles in 1973 to 965,000 in 1978. However, this expansion was beginning to cause friction; Chrysler saw their overseas markets for subcompacts as being directly encroached by their Japanese partners, while MMC felt the Americans were demanding too much say in their corporate decisions.

Mitsubishi finally achieved annual production of one million cars in 1980, but by this time its ally was not so healthy; As part of its battle to avoid bankruptcy, Chrysler was forced to sell its Australian manufacturing division to MMC that year. The new Japanese owners renamed it Mitsubishi Motors Australia Ltd (MMAL), and since then it has stood as one of the largest car production facilities in the country.

In 1982, the Mitsubishi brand was introduced to the American market for the first time. The Tredia sedan, and the Cordia and Starion coupés, were initially sold through 70 dealers in 22 states, with an allocation of 30,000 vehicles between them. This quota, restricted by mutual agreement between the two countries' governments, had to be included among the 120,000 cars earmarked for Chrysler. Toward the end of the 1980s, as MMC initiated a major push to increase its U.S. presence, it aired its first national television advertising campaign, and made plans to increase its dealer network to 340 dealers. By 1989, Mitsubishi's worldwide production, including its overseas affiliates, had reached 1.5 million units.

Despite the ongoing tensions between Chrysler and Mitsubishi, they agreed to unite in a vehicle manufacturing operation in Normal, Illinois. The 50/50 venture provided a way to circumvent the voluntary import restrictions, while providing a new line of compact and subcompact cars for Chrysler. Diamond-Star Motors (DSM) — from the parent companies' logos: three diamonds (Mitsubishi) and a pentastar (Chrysler) — was incorporated in October 1985, and in April 1986 ground was broken on a 1.9 million square-foot (177,000 m²) production facility. In 1987, the company was selling 67,000 cars a year in the U.S., but when the plant was completed in March 1988 it offered an annual capacity of 240,000 vehicles. Initially, three platform-sharing compact 2+2 coupés were released, the Mitsubishi Eclipse, Eagle Talon and Plymouth Laser, with other models being introduced in subsequent years.

Mitsubishi Motors went public in 1988, ending its status as the only one of Japan's eleven auto manufacturers to be privately held. Mitsubishi Heavy Industries agreed to reduce its share to 25 percent, retaining its position as largest single stockholder. Chrysler, meanwhile, increased its holding to over 20 percent. The capital raised by this initial offering enabled Mitsubishi to pay off part of its debts, as well as to expand its investments throughout south-east Asia where it was by now operating in the Philippines, Malaysia, and Thailand.
Hirokazu Nakamura became president of Mitsubishi in 1989 and steered the company in some promising directions. Sales of the company's new Pajero were bucking conventional wisdom by becoming popular even in the crowded streets of Japan. Although sales of SUVs and light trucks were booming in the U.S., Japan's car manufacturers dismissed the idea that such a trend could occur in their own country. Nakamura, however, increased the budget for sport utility product development, and his gamble paid off; Mitsubishi's wide line of four-wheel drive vehicles, from the Mitsubishi Pajero Mini kei car to the Delica Space Gear passenger van, rode the wave of SUV-buying in Japan in the early to mid-1990s, and Mitsubishi saw its overall domestic share rise to 11.6 percent in 1995.

In 1991, Chrysler sold its equity stake in Diamond Star Motors to its partner, and from then on they continued to share components and manufacturing on a contractual basis only. Chrysler decreased its interest in Mitsubishi Motors to less than 3 percent in 1992, and announced its decision to divest itself of all its remaining shares on the open market in 1993. The two companies nevertheless continued their close alliance, with Chrysler supplying engines and transmissions for DSM, and Mitsubishi marketing Chrysler products overseas.

DSM was officially renamed Mitsubishi Motor Manufacturing of America on July 1, 1995.

After a starvation of new investment caused by lack of cashflow, the company introduced the award-winning Mitsubishi i kei car in 2006, its first new model in 29 months, while a revised Outlander has been introduced worldwide to compete in the popular XUV market niche. The next generation of its Lancer and Lancer Evolution will follow in 2007 and 2008.

Slow selling vehicles were eliminated from the U.S. market, purchase projections for the Global Engine Manufacturing Alliance have been scaled back, and 10,000 jobs have been shed to cut costs with 3,400 workers at its Australian plant and other loss-making operations still under threat. Meanwhile, in an effort to increase production at its U.S. facility, new export markets for the Eclipse and Galant are being explored in Ukraine, the Middle East, and Russia, where the company's bestselling dealership is located. Mitsubishi has also been active in OEM production of cars for Nissan, and announced a similar partnership with PSA Peugeot Citroën in July 2005 to manufacture an SUV on their behalf.

Mitsubishi reported its first profitable quarter in four years in the third quarter of 2006, and targets a return to profitability by the end of the 2006 financial year, and sustained profitability and global sales of 1,524,000 through 2007.

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