A non-reciprocal circuit element includes high-pass-type first and second isolators, which are each provided with first and second central electrodes that are arranged on a ferrite so as to cross each other while being insulated from each other, the ferrite being applied with a direct-current magnetic field by permanent magnets. One end of the first central electrode defines an input port and another end of the first central electrode defines an output port, and one end of the second central electrode defines the input port and another end of the second central electrode defines a ground port. A pass frequency band of the first isolator is higher than a pass frequency band of the second isolator. Inputs of the isolators are electrically connected to each other to define a single input terminal IN and a low-pass filter LPF is provided between the input terminal IN and the input port of the second isolator.