Automatic analyzer

A dispensing mechanism having a probe for a specimen or a reagent for use in an automatic analyzer, the dispensing mechanism, comprising:

• a first arm and a second arm an arm of two degrees of rotational freedom supporting the probe;
• a first shaft and a second shaft that support the first arm and second arms and transmit power to the first and second arms;
• a plurality of motors that provide power allowing the first and second shafts to be rotated and vertically moved, the plurality of motors including a first motor configured to rotate the first shaft, a second motor configured to rotate the second shaft, and a third motor configured to vertically move the first shaft and the second shaft;
• and
• a base that supports a lower end of the second shaft,
• wherein the second shaft is divided in an axial direction in an upper shaft and a lower shaft having different diameters,
• upon lowering of the first and second arms by the power of the third motor, the upper shaft and lower shaft are housed inside the other, whereby the second shaft is shortened,
• wherein the upper shaft is disposed within the first shaft, and
• wherein the second motor that provides power to rotate the second shaft is disposed on a lateral side of the base.