PROBLEM TO BE SOLVED: To provide an exercise analysis device, an exercise analysis system, an exercise analysis method, an exercise analysis program and the like capable of grasping exercise of a left-foot and a right-foot with a simple configuration.SOLUTION: An exercise analysis device 2 includes: an acquisition section 242 acquiring detection results from a sensor (inertia measurement unit 10) being mounted onto a user and detecting information related to exercise of the user and a left/right determination section 243 performing determination processing determining whether it is a first period including a right-foot grounding period of the user or a second period including a left-foot grounding period of the user on the basis of the detection results.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2016,JPO&INPIT【課題】簡易な構成で左足及び右足の運動を把握できる、運動解析装置、運動解析システム、運動解析方法及び運動解析プログラム等を提供すること。【解決手段】運動解析装置2は、使用者に取り付けられ、使用者の運動に関する情報を検出するセンサー(慣性計測ユニット10)から検出結果を取得する取得部242と、前記検出結果に基づいて、使用者の右足接地期間を含む第1期間と、使用者の左足接地期間を含む第2期間のいずれの期間であるかを判定する判定処理を行う左右判定部243と、を含む。【選択図】図9