Portable pressure measuring apparatus

It is an object of the present invention to provide a portable pressure measuring apparatus to be used as an altimeter, which can be automatically switched to an optimum sampling period in accordance with a use of the apparatus before a pressure measurement at all times. A portable pressure measuring apparatus additionally comprises a pressure/altitude operation section for obtaining an altitude from a measured pressure by an arithmetic operation, a rate of pressure change operation section, and a movement detecting section, wherein, if the movement detecting section detects a movement, a pressure is measured in a sampling period, for example, in a 1-second sampling period, if a rate of altitude change is equal to or greater than a threshold or in a sampling period, for example, in a 5-second sampling period, if the rate of altitude change is smaller than the threshold and wherein, unless the movement detecting section detects any movement, the pressure sampling measurement is not performed.