PROBLEM TO BE SOLVED: To provide a biological information measuring device for measuring biological information over a certain period that can reduce power consumption.SOLUTION: In S1, biological information of a person to be measured is detected through a sensor part. In S2-S6, it is determined whether or not the detection output of the sensor part has substantially changed for each predetermined determination unit period. In S8 and S11, an index showing the biological information for each output unit period longer than the determination unit period is output based on the detection output of the sensor part. In S9, when it is determined that the detection output of the sensor part has substantially changed in Steps S2-S6 in a certain output unit period, processes of Steps S1-S6 are stopped for a residual period later than the determination unit period in which it is determined that the detection output of the sensor part has substantially changed in that output unit period.
