An electrocardiography device is provided, including an adhesive assembly, a printed circuit board, two electrodes, a power supply assembly, and a sensing assembly. The printed circuit board is disposed on the adhesive assembly. The electrodes are connected to the circuit board and arranged along a first direction. The power supply assembly and the sensing assembly are disposed on the adhesive assembly and arranged along a second direction. The first direction is different from the second direction, and the power supply assembly is separate from the sensing assembly.
