For the purpose of determining blood pressure with high precision, a blood pressure determination device of the present invention includes: pulse wave calculating means that calculates, on the basis of a pressure signal in a specific time period and of a pulse wave signal measured in the specific time period due to pressure related to the pressure signal, a plurality of timings at which the pulse wave signal satisfies a predetermined condition, a time period that represents a difference between the timings, and a pressure value of the pressure signal in the time period, and calculates pulse wave information that associates the time period with the pressure value data extracting means that extracts a specific data range from the pulse wave information on the basis of an arterial viscoelasticity indicator and blood pressure determining means that determines diastolic blood pressure on the basis of a correspondence relationship between a pressure value and a time period within the data range.
