Disclosed is an analyzing apparatus comprising first drive means (71) for applying rotational motions to a turntable (101) to be set with an analyzing device, second drive means (72) for engaging selectively with the first drive means (71) to apply reciprocal motions to the analyzing device, and third drive means (73) for moving the first drive means (71) and the second drive means (72) relatively to positions, at which the two means engage or do not. In the mixing agitation of a minute quantity of liquid, therefore, the analyzing apparatus can achieve a necessary acceleration even for a short time period.