PURPOSE: A fuel supply device, a fuel gauge, a pressure sensor, a fuel cell system, an electronic device, a preparation method of a fuel cartridge and a detection method of fuel level are provided, to improve the predicting property of the fuel level in a fuel supply part with maintaining safety. CONSTITUTION: The fuel supply device comprises a fuel container(100) provided with an inner chamber for accommodating fuel; and a pressure detection unit located in the inner chamber, wherein the pressure detection unit provides an output signal displaying the amount of the fuel remaining in the fuel container. Preferably the pressure detection unit comprises a rigid body substrate; a pressure converter combined with the substrate; a flexible circuit combined with the pressure converter so as to be capable of communicated; and a communication channel combined with the flexible circuit so as to be capable of communicated, wherein the communication channel transmits the output signal to an operation device.
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