An inexpensive delay-breaking fuse which assures that when an electric current having an intensity in excess of a value representing a steady-state current such as a motor lock electric current or the like flows through the delay-breaking fuse, durability of the fuse is left unchanged, a stable prearching time/current characteristic is maintained, and moreover, there does not arise a malfunction that a housing is thermally deformed or the color of the housing is changed to other one. The delay-breaking fuse includes a fuse element having a pair of female terminal portions arranged on the opposite sides thereof with an electrical conductive melting portion having a reduced width bridged therebetween with a melting/breaking part located at the intermediate position of the electrical conductive melting portion. A pair of heat radiating plates are projected upward of the upper end edge of a base plate integrated with the female terminal portions in order to radiate heat from the electrical conductive melting portion. The heat radiating plates are caused to extend from the upper end edge of the base plate while they are located adjacent to the electrical conductive melting portion.