An altitude information acquiring device includes a measuring unit which measures atmospheric pressure; a wireless communication unit which performs near field communication with an external device; and an altitude information acquiring unit which acquires altitude information from an external positioning device through the wireless communication unit. An inversion detecting unit detects an inversion of a changing direction of the atmospheric pressure periodically measured by the measuring unit, and a communication control unit controls a timing to acquire the altitude information through the wireless communication unit at a set timing, based on the inversion detected by the inversion detecting unit. An integrated altitude change acquiring unit acquires a rise altitude integrated value obtained by integrating an amount of altitude change in a rising direction and a fall altitude integrated value obtained by integrating an amount of altitude change in a falling direction, based on the acquired altitude information.