An analysis apparatus comprising: a detention tank in which a liquid is stored; and a voltage applier including a power source and a contact tip to be brought into contact with the liquid for applying a voltage necessary for analyzing the liquid; wherein the voltage applier is arranged to replace a used contact tip with an unused contact tip after completing an analysis and before starting a subsequent analysis, and wherein the voltage applier includes a plurality of electrodes and is arranged to soak each of the electrodes in the detention tank, so that a portion of said each of the electrodes soaked in the liquid is used as the contact tip, the analysis apparatus being characterised in that: the voltage applier is arranged to sequentially soak each of the electrodes in the detention tank, each of the plurality of electrodes has a bar shape, and the voltage applier further includes a retention unit that slidably retains the plurality of electrodes serially aligned in a longitudinal direction thereof, the retention unit includes a conductive portion for electrical connection between the power source and each of the electrodes, and each of the electrodes includes a through-hole longitudinally penetrating therethrough, and the voltage applier further includes an introduction nozzle for introducing the liquid through the through-hole. a detention tank in which a liquid is stored; and a voltage applier including a power source and a contact tip to be brought into contact with the liquid for applying a voltage necessary for analyzing the liquid; wherein the voltage applier is arranged to replace a used contact tip with an unused contact tip after completing an analysis and before starting a subsequent analysis, and wherein the voltage applier includes a plurality of electrodes and is arranged to soak each of the electrodes in the detention tank, so that a portion of said each of the electrodes soaked in the liquid is used as the contact tip, the analysis apparatus being characterised in that: the voltage applier is arranged to sequentially soak each of the electrodes in the detention tank, each of the plurality of electrodes has a bar shape, and the voltage applier further includes a retention unit that slidably retains the plurality of electrodes serially aligned in a longitudinal direction thereof, the retention unit includes a conductive portion for electrical connection between the power source and each of the electrodes, and each of the electrodes includes a through-hole longitudinally penetrating therethrough, and the voltage applier further includes an introduction nozzle for introducing the liquid through the through-hole. the voltage applier is arranged to sequentially soak each of the electrodes in the detention tank, each of the plurality of electrodes has a bar shape, and the voltage applier further includes a retention unit that slidably retains the plurality of electrodes serially aligned in a longitudinal direction thereof, the retention unit includes a conductive portion for electrical connection between the power source and each of the electrodes, and each of the electrodes includes a through-hole longitudinally penetrating therethrough, and the voltage applier further includes an introduction nozzle for introducing the liquid through the through-hole.