An automatic analyzer that analyzes a sample, comprising: a first dispensing probe and a second dispensing probe configured to dispense the sample or a reagent; a plurality of vertical moving mechanisms (109, 110) that are each provided for each of the first dispensing probe and the second dispensing probe and that are configured to move the first dispensing probe and the second dispensing probe into contact with the sample or the reagent received in a plurality of bottles simultaneously with each other; a first oscillator for supplying an alternating voltage having oscillation frequency f1 to the first dispensing probe; a second oscillator for supplying an alternating voltage having oscillation frequency f2 to the second dispensing probe, a first frequency attenuator that is provided for the first oscillator; a second frequency attenuator that is provided for the second oscillator; a first liquid level detection determining unit that is provided for the first dispensing probe and that is configured to determine, from a voltage change derived from the contact, whether or not the first dispensing probe has contacted a liquid surface of the liquid sample or liquid reagent on the basis of a signal output from the first frequency attenuator, the first liquid level detection determining unit causing to stop the movement operations of the vertical moving mechanisms if the first liquid level detection determining unit determines that the first dispensing probe has contacted the liquid surface; and a second liquid level detection determining unit that is provided for the second dispensing probe and that is configured to determine, from a voltage change derived from the contact, whether or not the second dispensing probe has contacted a liquid surface of the liquid sample or liquid reagent on the basis of a signal output from the second frequency attenuator, the second liquid level detection determining unit causing to stop the movement operations of the vertical moving mechanisms if the second liquid level detection determining unit determines that the second dispensing probe has contacted the liquid surface; characterized in that: the frequency difference between oscillation frequency f1 and oscillation frequency f2 is equal to or higher than 1 kHz and lower than 1000 kHz; and the first and second frequency attenuators are each configured to attenuate high-frequency signal components superimposed on signals indicating the contact with the sample or the reagent, and not remove the signals indicating the contact with the sample or the reagent themselves, wherein the high-frequency signal components correspond to the frequency difference between oscillation frequency f1 and oscillation frequency f2. a first dispensing probe and a second dispensing probe configured to dispense the sample or a reagent; a plurality of vertical moving mechanisms (109, 110) that are each provided for each of the first dispensing probe and the second dispensing probe and that are configured to move the first dispensing probe and the second dispensing probe into contact with the sample or the reagent received in a plurality of bottles simultaneously with each other; a first oscillator for supplying an alternating voltage having oscillation frequency f1 to the first dispensing probe; a second oscillator for supplying an alternating voltage having oscillation frequency f2 to the second dispensing probe, a first frequency attenuator that is provided for the first oscillator; a second frequency attenuator that is provided for the second oscillator; a first liquid level detection determining unit that is provided for the first dispensing probe and that is configured to determine, from a voltage change derived from the contact, whether or not the first dispensing probe has contacted a liquid surface of the liquid sample or liquid reagent on the basis of a signal output from the first frequency attenuator, the first liquid level detection determining unit causing to stop the movement operations of the vertical moving mechanisms if the first liquid level detection determining unit determines that the first dispensing probe has contacted the liquid surface; and a second liquid level detection determining unit that is provided for the second dispensing probe and that is configured to determine, from a voltage change derived from the contact, whether or not the second dispensing probe has contacted a liquid surface of the liquid sample or liquid reagent on the basis of a signal output from the second frequency attenuator, the second liquid level detection determining unit causing to stop the movement operations of the vertical moving mechanisms if the second liquid level detection determining unit determines that the second dispensing probe has contacted the liquid surface;