Pressure measurement device

A pressure measurement device comprising:

• a pressure sensor;
• and
• a pressure calculation unit;
• wherein the pressure sensor includes
• a diaphragm layer,
• a pressure receiving region formed in the diaphragm layer,
• a piezostrictive measurement unit provided in the diaphragm layer in an outer peripheral portion of the pressure receiving region, and formed of a piezostrictive element that measures a strain of the pressure receiving region by using a piezoresistive effect, and
• a magnetostrictive measurement unit provided in the pressure receiving region of the diaphragm layer, and formed of a magnetostrictive element that is formed of a material whose magnetization is changed due to the strain, and that measures the strain of the pressure receiving region, and
• the pressure calculation unit includes
• a first calculation function unit configured to calculate a pressure value received by the pressure receiving region, based on a measurement result of the piezostrictive measurement unit,
• a second calculation function unit configured to calculate a pressure value received by the pressure receiving region, based on a measurement result of the magnetostrictive measurement unit, and
• a switching function unit configured to output the pressure value calculated by the second calculation function unit until the pressure value calculated by the first calculation function unit exceeds a set threshold value, and to output the pressure value calculated by the first calculation function unit when the pressure value calculated by the first calculation function unit exceeds the threshold value.