The present invention has an object to provide a wireless apparatus which is capable of correctly sampling a waveform of a pulse even when a shape of the pulse is varied.A synchronizing apparatus for causing an input signal to be synchronized with a clock signal is equipped with sampling unit 102, 103, and delay control unit 112. The sampling unit 102 and 103 sample the input signal at first sampling timing and second sampling timing, which are separated from each other in a predetermined time interval. The delay control unit 112 shifts both the first and second sampling timing during synchronous pull-in operation, and also, narrows the interval between said first and second sampling timing during synchronous follow-up operation. A synchronous status judging unit 105 judges whether or not the input signal is synchronized with the clock signal based upon a phase error amount outputted from a phase error calculating unit 104, and outputs the synchronous status to a delay amount control unit 106. The delay amount control unit 106 controls to increase/decrease delay amounts which have been presently set in variable delay devices 107 and 108 based upon the phase error amount outputted from the phase error calculating unit 104 and the synchronous status outputted from the synchronous status judging unit 105.