A fuse (1) with a frequency separation function includes an input port portion (1a), an output port portion (1b), a first transmitting portion (1c) which is provided between the input port portion and the output port portion, the first transmitting portion (1c) configured to transmit a lightning surge current entering the input port portion and guide the lightning surge current to the output port portion, a second transmitting portion (1d) which is provided between the input port portion and the output port portion, the second transmitting portion configured to be capable of transmitting a normal current and an abnormal current entering the input port portion, and a melting mechanism portion (1d-2) which is provided between the second transmitting portion and the input port portion or between the second transmitting portion and the output port portion, the melting mechanism configured not to melt and break when the normal current passes, and configured to melt and break when the abnormal current passes.