A portable oximeter for detecting an oxygen concentration of a finger is disclosed. The portable oximeter includes a wristband, a controlling unit, a first sensor, and a second sensor. The controlling unit is located on the wristband. The first sensor is connected to the wristband and electrically connected to the controlling unit. The first sensor includes a light emitting part for emitting a light. The second sensor is connected to the wristband and electrically connected to the controlling unit. The second sensor includes a light receiving part for receiving the light. When the first sensor moves, allowing the light emitting part towards the light receiving, a sensing space is formed between the first sensor and the second sensor. The sensing space is used for containing to finger, to detect the oxygen concentration.一種攜帶式血氧計,用以偵測手指的血氧濃度。攜帶式血氧計包括一手環帶、一控制單元、一第一偵測部和一第二偵測部。控制單元設於手環帶。第一偵測部連接手環帶並電性連接控制單元,第一偵測部包括一光線發射件,其用以發射一光線。第二偵測部連接手環帶並電性連接控制單元,第二偵測部包括一光線接收件,其用以接收光線。當第一偵測部移動,使得光線發射件朝向光線接收件時,第一偵測部和第二偵測部之間形成一偵測空間,用以容置手指以偵測血氧濃度。1‧‧‧攜帶式血氧計10‧‧‧手環帶13‧‧‧卡固件20‧‧‧控制單元23‧‧‧連接部30‧‧‧第一偵測部40‧‧‧第二偵測部
