PROBLEM TO BE SOLVED: To provide a physical activity measuring system, a physical activity measuring device and a physical activity measuring method, capable of measuring physical activity amounts while taking weather conditions into consideration.SOLUTION: The physical activity measuring system 1 includes a weather measuring device 2, and a physical activity measuring device 4 capable of measuring the physical activity of a user. The physical activity measuring device 4 includes a weather data acquiring section 31 for acquiring weather data measured by the weather measuring device 2, and a physical activity calculating section 32 for calculating the physical activity of the user by utilizing the weather data acquired by the weather data acquiring section 31.COPYRIGHT: (C)2013,JPO&INPIT【課題】気象状況を考慮した活動量を計測可能な活動量計測システム、活動量計測装置及び活動量計測方法を提供すること。【解決手段】活動量計測システム1は、気象計測装置2と、ユーザーの活動量を計測することができる活動量計測装置4と、を含む。活動量計測装置4は、気象計測装置2が計測した気象データを取得する気象データ取得部31と、気象データ取得部31が取得した気象データを利用して、ユーザーの活動量を計算する活動量計算部32と、を含む。【選択図】図3