A mean venous pressure measurement apparatus comprising: a cuff attachable to a portion including a vein and an artery in a living body; a pressure control unit configured to control an applied pressure applied by said cuff to said portion; and a pulse wave detection unit configured to detect a pulse wave from a pressure received by said cuff from said portion, wherein the pressure control unit is further configured to repeatedly increase the applied pressure from 0 mmHg with a predetermined pressure increment until the applied pressure is equal to or higher than arterial diastolic pressure, and wherein the pulse wave detection unit is configured to measure a pulse wave before each pressure increment and to terminate the measurement when the applied pressure is equal to or higher than arterial diastolic pressure; the apparatus further comprising a pressure waveform analyzing unit configured to: store the pulse wave measured before each pressure increment along with the applied pressure, set the pulse wave measured when the applied pressure is increased to equal to or higher than arterial diastolic pressure as a maximum value to a reference waveform, analyze a correlation either calculated by obtaining the subtraction waveform by subtracting the reference waveform from each of the pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure or as contribution ratio R 2 between the reference waveform and each of said pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure, and estimate a mean venous pressure based on said applied pressure, the pulse wave detected by the pulse wave detection unit, and a result of analysis of the correlation by said analyzing unit, wherein said mean venous pressure is estimated as the applied pressure when the correlation between the reference waveform and the pulse wave is minimized. a cuff attachable to a portion including a vein and an artery in a living body; a pressure control unit configured to control an applied pressure applied by said cuff to said portion; and a pulse wave detection unit configured to detect a pulse wave from a pressure received by said cuff from said portion, wherein the pressure control unit is further configured to repeatedly increase the applied pressure from 0 mmHg with a predetermined pressure increment until the applied pressure is equal to or higher than arterial diastolic pressure, and wherein the pulse wave detection unit is configured to measure a pulse wave before each pressure increment and to terminate the measurement when the applied pressure is equal to or higher than arterial diastolic pressure; the apparatus further comprising a pressure waveform analyzing unit configured to: store the pulse wave measured before each pressure increment along with the applied pressure, set the pulse wave measured when the applied pressure is increased to equal to or higher than arterial diastolic pressure as a maximum value to a reference waveform, analyze a correlation either calculated by obtaining the subtraction waveform by subtracting the reference waveform from each of the pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure or as contribution ratio R 2 between the reference waveform and each of said pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure, and estimate a mean venous pressure based on said applied pressure, the pulse wave detected by the pulse wave detection unit, and a result of analysis of the correlation by said analyzing unit, wherein said mean venous pressure is estimated as the applied pressure when the correlation between the reference waveform and the pulse wave is minimized. store the pulse wave measured before each pressure increment along with the applied pressure, set the pulse wave measured when the applied pressure is increased to equal to or higher than arterial diastolic pressure as a maximum value to a reference waveform, analyze a correlation either calculated by obtaining the subtraction waveform by subtracting the reference waveform from each of the pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure or as contribution ratio R 2 between the reference waveform and each of said pulse waves detected by said pulse wave detection unit when a pressure lower than arterial diastolic pressure is set to said applied pressure, and estimate a mean venous pressure based on said applied pressure, the pulse wave detected by the pulse wave detection unit, and a result of analysis of the correlation by said analyzing unit, wherein said mean venous pressure is estimated as the applied pressure when the correlation between the reference waveform and the pulse wave is minimized.