To allow a fuse element to be made lead-free, while making the operating speed and a small dimensional properties of a protective element kept, in a circuit protective element such as a board type temperature fuse or a board type temperature fuse with a resistor.

A pair of fusible alloy piece jointing electrodes 21 and 22 are formed on an insulation board 1; both ends 31 and 32 of a fusible alloy piece 3 are jointed to the respective fusible alloy piece jointing electrodes 21 and 22, respectively; lead conductors 41 and 42 are mounted to the respective fusible alloy piece jointing electrodes so as to form gaps (g) between the respective fusible alloy piece jointing electrodes and them, and to face the tips of the gaps to the ends 31 and 32 of the fusible alloy pieces. When the fusible alloy piece is fused, the fused alloy is sucked into the gap by capillary phenomenon, and the fusible alloy is can be severed rapidly by that portion.