The Mazda R360 is a kei car manufactured and marketed by Mazda as the company's first passenger car — a two-door, four-seat coupé. Introduced in 1960, the R360 featured a 1,760 mm (69.3 in) wheelbase, weighed 380 kg (838 lb) and was powered by a rear-mounted air-cooled 356 cc V-twin engine producing 16 PS (12 kW)^[1] and 22 N⋅m (16 lb⋅ft) of torque. The car was capable of 84 km/h (52 mph)^[2] and featured a 4-speed manual or two-speed automatic transmission.^[1] The suspension, front and rear, was rubber "springs" and torsion bars.^{[citation needed]}

Within a few years of introducing the R360, Mazda had captured much of the lightweight (kei car) market in Japan. The R360 was augmented by the Mazda P360 "Carol" two-door and four-door sedan in 1962. Production of the R360 lasted for six years.

There were two variants of the Mazda R360, officially known as KRBB and KRBC.^[3] Both variants were very similar visually, however the first generation, KRBB came with a 4-speed manual transmission, whereas the second generation KRBC came with a 2-speed "TORQ DRIVE" automatic transmission.

The B360 was a pickup truck bodystyle based on parts of the R360 Coupé. It used the same 356 cc engine, but in a front-engine, rear-wheel-drive layout. Like most pickups, it used a rigid rear axle and leaf spring suspension. The engine was replaced with the Carol's 358 cc I4 in 1964, and the B360 was replaced by the Mazda E360 in 1967.

A larger B600 pickup was introduced for the export market. It used a 577 cc version of the Mazda V-twin.