1. A sample dispensing apparatus comprising a probe for sucking and ejecting a sample, a dispensing syringe for generating a pressure in said probe to suck and eject the sample, a dispensing flow passage connecting said probe and said dispensing syringe, and a control unit for controlling sucking and ejection operations of the sample, said apparatus further comprising: at least one pressure sensor for detecting a pressure in said dispensing flow passage; pressure value storing means for time-serially storing output values of said pressure sensor during an operation of dispensing the sample; storage means for storing a reference database consisted of time-serial output values of said pressure sensor, which are obtained when the sample is normally sucked or ejected by said probe; and determining means for carrying out multi-variable analysis of both said reference database and comparison data created based on the output values of said pressure sensor time-serially stored in said pressure value storing means, and for determining the presence or absence of an abnormality in the dispensing operation of the sample based on an analysis result.