An automatic analyzer comprising: a dispensation probe (24, 27) adapted to suck in a sample or a reagent stored in a sample container or a reagent bottle and to discharge the sample or reagent to a reaction cuvette; a syringe adapted to perform the suction and discharge operation of the dispensation probe; a pressure detector adapted to detect a pressure in the dispensation probe; an analysis unit adapted to analyzed the sample in the reaction cuvette; a storage unit adapted to store information on a type of the sample, a sampling position, a dispensation quantity, and properties of the reagent as known information; an arithmetic processing unit adapted to segment the suction and discharge operation of the dispensation probe into time sections, to analyze a pressure waveform detected by the pressure detector and to judge presence/absence of a dispensation abnormality by comparing a result of an analysis of a pressure waveform detected by the pressure detector in regard to each of the time sections with a certain criterion; and a display unit adapted to display the presence/absence of the dispensation abnormality as a result of the judgment by the arithmetic processing unit; characterized in that the arithmetic processing unit is adapted to segment the suction and discharge operation into the following time sections: a time section (a) from a point just after the start of the operation of the syringe till the syringe reaches a constant speed; a time section (b) during which the syringe maintains the constant speed; a time section (c) from a point when the operation speed of the syringe starts decreasing to a point when the syringe stops; and a certain length of time section (d) after the stoppage of the operation of the syringe based on the known information stored in the storage unit. a dispensation probe (24, 27) adapted to suck in a sample or a reagent stored in a sample container or a reagent bottle and to discharge the sample or reagent to a reaction cuvette; a syringe adapted to perform the suction and discharge operation of the dispensation probe; a pressure detector adapted to detect a pressure in the dispensation probe; an analysis unit adapted to analyzed the sample in the reaction cuvette; a storage unit adapted to store information on a type of the sample, a sampling position, a dispensation quantity, and properties of the reagent as known information; an arithmetic processing unit adapted to segment the suction and discharge operation of the dispensation probe into time sections, to analyze a pressure waveform detected by the pressure detector and to judge presence/absence of a dispensation abnormality by comparing a result of an analysis of a pressure waveform detected by the pressure detector in regard to each of the time sections with a certain criterion; and a display unit adapted to display the presence/absence of the dispensation abnormality as a result of the judgment by the arithmetic processing unit; characterized in that the arithmetic processing unit is adapted to segment the suction and discharge operation into the following time sections: a time section (a) from a point just after the start of the operation of the syringe till the syringe reaches a constant speed; a time section (b) during which the syringe maintains the constant speed; a time section (c) from a point when the operation speed of the syringe starts decreasing to a point when the syringe stops; and a certain length of time section (d) after the stoppage of the operation of the syringe based on the known information stored in the storage unit. a time section (a) from a point just after the start of the operation of the syringe till the syringe reaches a constant speed; a time section (b) during which the syringe maintains the constant speed; a time section (c) from a point when the operation speed of the syringe starts decreasing to a point when the syringe stops; and a certain length of time section (d) after the stoppage of the operation of the syringe based on the known information stored in the storage unit.