To speedily and surely discriminate whether each of measuring portions of an electrocardiogram is normal or abnormal and to learn the discrimination of the electrocardiogram in a short time.

The upper side of a measuring scale 1 for electrocardiogram is equipped with a scale 2 showing the upper limit of width of P wave, a scale 3 showing a normal range and an abnormal range at the interval of width PQ from rising of P wave to falling of Q wave, a scale 4 showing a normal range and an abnormal range for a length QRS from falling of Q wave to the ending point of S wave, a scale 5 showing a normal range and an abnormal range for a length QT from falling of Q wave to falling of T wave and a scale 6 showing a normal range and an abnormal range at the interval of a length R-R from the apex of R wave to the apex of the next R wave. The left side thereof is equipped with a scale 10 showing a normal range for the height of P wave, a scale 11 showing a normal range and an abnormal range for the maximum width of QRS, a scale 12 showing a normal range for the height of R wave, a scale 13 showing a normal range for the height of T wave and a scale 14 showing a normal range for the height of U wave.