An automatic analyzer having a liquid sample dispensing mechanism which comprises: a sample probe (11a, 12a); a syringe for suctioning a liquid sample of blood cells or whole blood from and discharging the liquid sample to the sample probe (11a, 12a); a first flow channel connecting the sample probe (11a, 12a) and the syringe; cleaning solution supply means for supplying cleaning solution for cleaning the inside of the sample probe (11a, 12a); a second flow channel connecting the cleaning solution supply means and the syringe, wherein the cleaning solution supply means comprises a pump and is arranged to supply cleaning solution, through the second flow channel, the syringe, the first flow channel and the sample probe (11a, 12a); a pressure sensor that is configured to measure a pressure of a flow channel inside of the sample probe (11a, 12a); an electromagnetic valve for opening and closing the second flow channel; characterized in that the liquid sample dispensing mechanism further comprises: means configured to: conduct, before the liquid sample is suctioned, an air suction operation of the sample probe (11a, 12a) and an operation filling water to a distal end of the sample probe (11a, 12a) after the air suction operation, examine, before the liquid sample is suctioned, whether the sample probe (11a, 12a) is clogged based on a pressure value measured by the pressure sensor at a time after the air suction operation, and determine, based on the examination result, whether the sample probe (11a, 12a) is not clogged, or whether the sample probe (11a, 12a) is clogged and requires cleaning. a sample probe (11a, 12a); a syringe for suctioning a liquid sample of blood cells or whole blood from and discharging the liquid sample to the sample probe (11a, 12a); a first flow channel connecting the sample probe (11a, 12a) and the syringe; cleaning solution supply means for supplying cleaning solution for cleaning the inside of the sample probe (11a, 12a); a second flow channel connecting the cleaning solution supply means and the syringe, wherein the cleaning solution supply means comprises a pump and is arranged to supply cleaning solution, through the second flow channel, the syringe, the first flow channel and the sample probe (11a, 12a); a pressure sensor that is configured to measure a pressure of a flow channel inside of the sample probe (11a, 12a); an electromagnetic valve for opening and closing the second flow channel; characterized in that the liquid sample dispensing mechanism further comprises: means configured to: conduct, before the liquid sample is suctioned, an air suction operation of the sample probe (11a, 12a) and an operation filling water to a distal end of the sample probe (11a, 12a) after the air suction operation, examine, before the liquid sample is suctioned, whether the sample probe (11a, 12a) is clogged based on a pressure value measured by the pressure sensor at a time after the air suction operation, and determine, based on the examination result, whether the sample probe (11a, 12a) is not clogged, or whether the sample probe (11a, 12a) is clogged and requires cleaning. conduct, before the liquid sample is suctioned, an air suction operation of the sample probe (11a, 12a) and an operation filling water to a distal end of the sample probe (11a, 12a) after the air suction operation, examine, before the liquid sample is suctioned, whether the sample probe (11a, 12a) is clogged based on a pressure value measured by the pressure sensor at a time after the air suction operation, and determine, based on the examination result, whether the sample probe (11a, 12a) is not clogged, or whether the sample probe (11a, 12a) is clogged and requires cleaning.