biological information displaying time of day or stopwatch time on the display section 220 without measuring the biological information and displaying nothing without measuring the biological information by analyzing the biological information the device can assign an appropriate detection period needed for for example one day 24 hours or to break the day up according to activity such as a daytime activity zone or a night time sleeping zone for example the appropriate detection period will be different for each individual user therefore it is possible for the user to set the period to any desired value by using the operating section 250 therefore consumption of the battery 262 is slowed by not measuring too often when the rate of change of the information is small thus extending the battery life power consumption current consumption in the measurement device 1 according to one exemplary embodiment will be described when continuously measuring the pulse at a sampling rate of 15 hz for example hereinafter referred to as a u201c detection mode u201d current consumption is approximately 1400 u03bca when displaying time or the like without measuring including lighting of the backlight 224 and the like hereinafter referred to as a u201c time display mode u201d current consumption is approximately 460 u03bca when not measuring and displaying time without the back light u201c standby mode u201d current consumption is approximately 350 u03bca when not displaying and not measuring u201c non display mode u201d current consumption is approximately 14 u03bca here in.