To provide a phase/amplitude correcting circuit small in size, simple in configuration and capable of easily correcting the phase and amplitude of a high frequency current to be supplied to each antenna element of an array antenna.

When two excitation signals that mutually cross orthogonally are input, a separating means which consists of a signal distributor 1 that divides the two excitation signals into two each, a phase angle computing element 2 that produces phase angle data from the two excitation signals and an amplitude computing element 3 that generates amplitude data from the two excitation signals divides the excitation signal into the phase angle data and the amplitude data. A phase error data recorder 4 stores phase error data to the phase angle data, an amplitude error data recorder 5 stores amplitude error data to the amplitude data, a phase angle adder 7 adds the phase angle data and the phase angle error data and an amplitude adder 7 adds the amplitude data and the amplitude error data. There, a sending wave outputting means which has a correction I/Q(I signal/Q signal of an I/Q digital signal) computing element 8 and an I/Q synthesizer 11 synthesizes the output of the adder 6 and the output of the adder 7.