A finger clamping device and an oximeter using the finger clamping device are provided. The finger clamping device includes a casing, an upper clamping member, and a lower clamping member. The casing includes two sidewalls which face to each other. Each sidewall defines at least one sliding rail. The upper clamping member is arranged in the casing and defines two guiding shafts. The two guiding shafts are respectively received in the sliding rail and capable of sliding along the sliding rail. The lower clamping member faces to the upper clamping member and is connected to the upper clamping member by an elastic member. When a finger of a user inserts between the upper clamping member and the lower clamping member, the elastic member is stretched, the upper clamping member and the lower clamping member cooperatively clamp the finger of the user.本發明提供一種手指夾持裝置和具有手指夾持裝置的血氧儀。該手指夾持裝置包括：殼體，該殼體包括兩個相對設置的側壁，每一側壁上設置有至少一條滑軌；上夾板，相對兩側設置有至少一導杆，該導杆收容於該滑軌中並能沿該滑軌滑動；下夾板，與該上夾板相對設置並藉由一彈性件與該上夾板連接。當用戶手指伸入該上、下夾板之間時，該彈性件被拉伸，該彈性件的彈性回復力使得該上、下夾板實現對用戶手指的夾持。
