Blood pressure monitor having a function for calculating the degree of risk of circulatory diseases

There is provided an electronic blood pressure monitor, which can calculate an index value of the risk of cardiovascular disease based on the dynamics of the adjustment mechanisms of blood circulation. [Means for Solution] The blood pressure measuring device can, when the first blood pressure value on the pressure fluctuation of the air bellows, which is mounted on the measuring portion is calculated based (S5), when the second blood pressure value is stored within 5 minutes, after the first blood pressure value is measured ( YES in step S11), calculate the index value of the risk of circulatory diseases using the first blood pressure value and the second blood pressure value. (S13).