A venous pressure measurement apparatus comprising: a pressure controller that is configured to cause an internal pressure of a cuff to be attached to a subject , to change; a pressure detector that is configured to detect the internal pressure of the cuff ; and a processor that is configured to cause the pressure controller to change the internal pressure of the cuff , acquire a statistical value relating to a distribution of amplitudes of a plurality of pressure changes corresponding to pressure vibration that occurs in the cuff , and that is detected by the pressure detector , and estimate a venous pressure of the subject based on a change of the statistical value due to the change of the internal pressure of the cuff ; wherein the processor is configured to determine whether the change of the statistical value is transient or not, based on magnitude of change of the statistical value before and after an inflection point, and, if it is determined that the change of the statistical value is not transient, estimate the venous pressure of the subject, characterised in that the processor is further configured to: if it is determined that the change of the statistical value is transient, terminate the process. a pressure controller that is configured to cause an internal pressure of a cuff to be attached to a subject , to change; a pressure detector that is configured to detect the internal pressure of the cuff ; and a processor that is configured to cause the pressure controller to change the internal pressure of the cuff , acquire a statistical value relating to a distribution of amplitudes of a plurality of pressure changes corresponding to pressure vibration that occurs in the cuff , and that is detected by the pressure detector , and estimate a venous pressure of the subject based on a change of the statistical value due to the change of the internal pressure of the cuff ; cause the pressure controller to change the internal pressure of the cuff , acquire a statistical value relating to a distribution of amplitudes of a plurality of pressure changes corresponding to pressure vibration that occurs in the cuff , and that is detected by the pressure detector , and estimate a venous pressure of the subject based on a change of the statistical value due to the change of the internal pressure of the cuff ; wherein the processor is configured to determine whether the change of the statistical value is transient or not, based on magnitude of change of the statistical value before and after an inflection point, and, if it is determined that the change of the statistical value is not transient, estimate the venous pressure of the subject, characterised in that the processor is further configured to: if it is determined that the change of the statistical value is transient, terminate the process. determine whether the change of the statistical value is transient or not, based on magnitude of change of the statistical value before and after an inflection point, and, if it is determined that the change of the statistical value is not transient, estimate the venous pressure of the subject, characterised in that the processor is further configured to: if it is determined that the change of the statistical value is transient, terminate the process. <EOS>