Provided is an
electrode (1) which has a double structure including Cu or a Cu
alloy as an
electrode body (2) and a core material (3) made of W, Mo, a W-based
alloy, or a Mo-based
alloy embedded in a surface of the
electrode body (2) which is abutted against a material to be welded, the core material (3) being formed by using W, Mo, the W-based alloy, or the Mo-based alloy which is in the form of a fibrous structure extended by
sintering,
swaging, and annealing in an electrode axis direction, the fibrous structure having a horizontal cross-sectional average particle
diameter of 50 μm or more and an
aspect ratio of 1.5 or more. The electrode (1) can be used as an inexpensive electrode obtained by suppressing particle dropping / attrition and defects in electrodes for
spot welding, in which heat and pressure are applied repeatedly, stably enhancing durability.