PROBLEM TO BE SOLVED: To provide a physical activity measurement device capable of measuring a physical activity considering weather conditions, to provide a physical activity measurement system, to provide a program, and to provide a recording medium.SOLUTION: The physical activity measurement device 4 is carried by a user to measure a physical activity of the user. The physical activity measurement device 4 includes a weather measurement portion 20 which measures weather and a physical activity calculation section 32 which calculates the physical activity of the user. The physical activity calculation section 32 corrects and calculates the physical activity of the user based on the weather data measured by the weather measurement portion 20.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装置、活動量計測システム、プログラム及び記録媒体を提供すること。【解決手段】活動量計測装置4は、ユーザーに携帯され、ユーザーの活動量を計測する。活動量計測装置4は、気象を計測する気象計測部20と、ユーザーの活動量を計算する活動量計算部32と、を含む。活動量計算部32は、気象計測部20が計測した気象データに基づいて、ユーザーの活動量を補正計算する。【選択図】図3