An electrical wire fuse (1) provided with: a rod-shaped heat spot section (20) of circular cross-section having a sectional area that is smaller than another location due to the heat-molding of a portion of a core wire (10) connected in series with a circuit to be protected; a recessed section (30) formed as a depression on the outer peripheral surface of the heat spot section (20) at the same time that the heat spot section (20) is heat-molded; and a low melting-point metal (40) disposed on the recessed section (30).