PROBLEM TO BE SOLVED: To enable a subject to wear a guide cord for an electrocardiograph quickly and easily from a state of being packed compactly.SOLUTION: A guide cord holder for an electrocardiograph is a device for holding a guide cord for the electrocardiograph in a predetermined state, and includes a main body 10A forming a storage section inside of sheet-like members stacked vertically. In the state where at least a portion branched into the guide cord for a chest and a limb from a main code 40 is stored and held in the storage section, the guide cord for the electrocardiograph can be held in a state of exposing a tip side having electrodes while branched guide cords 6, 5a, 5b, 5c, 5d escape to the outside of the storage section through each predetermined insertion portion. In the electrocardiographic measurement, electrodes 60, 50 are worn while distributing the tip side of the guide cords 6, 5a, 5b, 5c, 5d in each measuring position in a state of being covered on a subject lying down on the back, and the measurement is performed.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT