An agitating device is described, a representative one of which includes: an agitating device for agitating a sample within a sample container, comprising: a base; a container holder for holding a sample container, which is provided so as to be movable relative to the base; and an agitation drive unit, which is provided on the base, for providing an agitation drive force to the container holder so as to cause the container holder to perform a agitating operation.