An automatic chemical analyzer, maintenance kit, and maintenance method capable of, even in a case where a problem of the automatic chemical analyzer occurs, clarifying a cause of the problem in a user site and coping with the problem without collecting a device or a component. The automatic chemical analyzer maintenance kit is connectable to an automatic chemical analyzer including a reaction vessel for accommodating at least a pipetted specimen and a reagent, and a stirring mechanism including a piezoelectric element that irradiates the reaction vessel with ultrasonic waves. The piezoelectric element includes a plurality of divided electrodes. The automatic chemical analyzer maintenance kit measures, for each of the divided electrodes, an absolute value of an impedance of the piezoelectric element and a phase difference between a voltage applied to the divided electrode and a current, and determines if there is an abnormality an electrode based on a measurement result.