A thermal fuse exhibiting a low electrical resistance at the time of conduction,in which fusion of a movable electrode(4)and a lead wire(2)is prevented even when temperature rise of an apparatus for connecting the thermal fuse is slow.A temperature sensitive material(7)fuses at a working temperature to unload a compression spring(9)which thereby expands to separate the movable electrode(4)from the lead wire(2)that are kept in press−contact by the compression spring(9),thus interrupting a current.The thermal fuse is characterized in that the material of the movable electrode(4)is obtained by subjecting an alloy of composition containing 99−80 pts.wt.of Ag and 1−20 pts.wt.of Cu to internal oxidation,wherein the thickness of the oxide lean layer of the surface layer of that material is 5μm or less and mean particle size of oxide particles in the material is 0.5−5μm.
