According to the present invention, provided is a blood glucose meter comprising: an outer cylinder capable of being coupled within alveolar bone, and having an open lower part； an inner cylinder inserted into and coupled to the inner space of the outer cylinder, and having an open lower part； a biosensor provided in the inner space of the inner cylinder and exposed through the open lower part of the outer cylinder and the open lower part of the inner cylinder； a data processor provided in the inner space of the inner cylinder and receiving a signal from the biosensor and processing the same； a transmitter provided in the inner space of the inner cylinder and transmitting the data of the data processor； and a battery provided in the inner space of the inner cylinder and supplying electric power to the biosensor, the data processor and the transmitter.
