A clip-type electrode for an electrocardiograph includes a pair of clamping plates for being opened and closed relative to each other about a common shaft and having concave surfaces facing each other, an electrode member mounted on one of the clamping plates, and a leaf spring bent into a U-shaped configuration for biasing ends of the clamping plates remote from the common shaft towards each other. Each of the pair of clamping plates has a slot at a position adjacent to the shaft for accommodating the leaf spring passed therethrough, and a plurality of grooves formed in an outer surface thereof and spaced at successively greater distances from the shaft. One end of the leaf spring is fitted into a one of the plurality of grooves in one of the clamping plates, and the other end of the leaf spring is fitted into one of the plurality of grooves in the other of the clamping plates, the grooves being chosen based upon the thickness of a limb, such as the wrist or ankle of a human body, that is to have the clip-type electrode attached thereto. The limb can thus be clamped with a prescribed clamping force irrespective of the thickness of the limb.