Abstract: A portable electrocardiographic recording analyzer incorporates means for counting the total sum of P, Q, R, S, T and U waves of electrocardiographic waveforms larger than a set reference voltage for a certain period of time; means for storing the preceding counted values; means for setting a reference value for the difference between the two means; signal means operating to issue an output when the difference between the value counted by the counting means and the value stored by the storing means is larger than a predetermined value; recording means for recording electrocardiographic waveforms in discontinuous periods of time which are set as desired; and means for storing an electrocardiographic waveform obtained when the signal means issues the output, along with an electrocardiographic wavform obtained at the preceding step.