The present invention relates to an electrocardiogram measurement apparatus (measurement sensor) which can be used in combination with a smartphone by an individual. The electrocardiogram measurement apparatus according to the present invention comprises: two amplifiers for receiving electrocardiogram signals from a first electrode and a second electrode； one electrode driving unit； a third electrode for receiving an output of the electrode driving unit； an A/D converter connected to an output terminal of each of the two amplifiers and converting analog signals into digital signals； a microcontroller for receiving the digital signals from the A/D converter； and a communication means for transmitting the digital signal, wherein: the microcontroller is supplied with power from a battery； the microcontroller controls the A/D converter and the communication means； and each of the two amplifiers amplifies one electrocardiogram signal so as to simultaneously measure two electrocardiogram signals.
