To attain the reduction in the number of elements of a lumped constant 180 Wilkinson divider causing the phase difference of 180 between the two output signals which are formed by distributing high frequency wave, microwave and millimeter wave signals in two directions in the Wilkinson divider.

In the 3 dB Wilkinson divider of two-direction transmission line type having two kinds of transmission-line type phase shifters, it is made possible to reduce the number of its elements without degrading the characteristics of the Wilkinson divider consisting of 11 elements by making the composition of the phase shifters into two equivalent -type circuits.