The blood pressure monitor manufacturers system as set forth in claim 1
, wherein said blood pressure variation determining means determines, as a first variation of the blood pressure of said subject, an absolute value of a difference between an amplitude of each of said pulses of the pulse wave detected by said pulse wave detecting means and an amplitude of a first prior one of said pulses detected a first predetermined time before said each pulse, and determines, as a second variation of the blood pressure monitor manufacturers, an absolute value of a difference between said amplitude of said each pulse and an amplitude of a second prior one of said pulses detected a second predetermined time before said each pulse, said second predetermined time being shorter than said first predetermined time,