A branching filter in which an input/output port. a first dielectric filter for use in transmission and a second dielectric filter for use in reception are coupled with each other through a branching filter circuit. The branching filter circuit includes a first line provided between the input/output port and an input port of the second dielectric filter. a second line provided between the input/output port and an output port of the first dielectric filter. and a third line provided between the input/output port and the ground. In the filter. conductor lines for use in connection between parts are used for the first and second lines.
