The Subaru Vivio is a kei car that was introduced in March 1992, and manufactured by Subaru until October 1998. It is small enough to place it in the kei car class, giving its owners large tax breaks in Japan. The Vivio has a spacious interior considering its small size, thanks to a relatively tall profile and large windows. The name "Vivio" is a reference to the engine's displacement of 660 written in an approximation of Roman numerals, and also inspired by the word vivid. It replaced the Rex nameplate that was introduced in the 1970s, and was itself superseded by the Subaru Pleo. The Vivio was available in 3 and 5-door versions, with a two-door targa top version named T-top also available.

The Subaru Rex , also known as Ace, Viki, Sherpa, 500/600/700, Mini Jumbo, Mini Subaru or M60/M70/M80 in various export markets, is a kei class automobile produced from 1972 to 1992 mainly for sale in Japan by Subaru, although it was also sold in Europe, South America, Australia and the Caribbean. The Rex superseded the R-2 as Subaru's kei car, and has been available in commercial use versions as well as in a passenger car version. It underwent major changes in 1976, in fall 1981, and again in late 1986. The second generation Rex (1981–1986) also formed the basis for the larger Subaru Justy.