A non-contact gait detection apparatus, which is applicable to a treadmill to execute a non-contact gait detection method, includes a wave transceiving module and a judgment module electrically connected with the wave transceiving module. The wave transceiving module, which is utilized for emitting an incident wave to a users first and second feet and is relatively arranged next to a users first foot, is configured to generate a reflected wave in relation to the first or second foot and to receive the reflected wave. The judgment module is utilized to receive the reflected wave and to judge the landing time of the users first or second foot in accordance with a peak value of the reflected wave, so that the pushing forward time and the individual time ratio for the users first and second feet can be computed. Therefore, the advantages including low cost, low wear, precise identification and easiness of telling which foot the users is taken can be obtained.一非接觸式步態偵測裝置,適用於一跑步機,執行一非接觸式步態偵測方法,該非接觸式步態偵測裝置包含一波收發模組,及一判斷模組,該波收發模組用於發射一入射波至使用者的一第一腳及一第二腳來產生一相關於第一腳或第二腳的反射波,且設置較鄰近該第一腳,並接收該反射波,該判斷模組電連接該波收發模組,接收該反射波並根據該反射波的峰值,判斷使用者的第一腳或第二腳的落地時間,進而可推算出使用者的該第一及該第二腳分別向前推進的時間及各自占多少的時間比例,而達到低成本、低磨損、準確辨識、輕易分辨使用者的左、右腳等優點。1‧‧‧跑步機11‧‧‧履帶2‧‧‧波收發模組21‧‧‧波接收器22‧‧‧波發射器3‧‧‧判斷模組31‧‧‧感測器32‧‧‧類比數位轉換器33‧‧‧處理器34‧‧‧顯示器
