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The Centrifuge Rotor (CR) system, presented at the last ICES (Ohtomi et al., 1999) and scheduled to be launched in 2004, provides an artificial gravitational environment for biological specimens housed in habitats on the International Space Station (ISS). This paper presents the concept and investigation for realizing the micro-gravity (micro-g) performance, that is, the vibration suppression performance of the CR system which is the artificial gravity generator. The CR is a significant new development that will provide artificial gravity for gravitational experiments involving relatively large biological specimens such as small animals and plants. The CR rotates habitats located radially around the axis and generates centrifugal force, imposing artificial gravity of arbitrary magnitude up to 22.0 m/s2 (about 2.2 g) on the specimens housed in the habitats.