To provide a waveform measuring apparatus for performing a discrimination processing operation in a short time.

The waveform measuring apparatus is provided with a measuring part 2 used to measure a voltage of an input signal S1 at a prescribed sampling cycle so as to output measured-value information D1; a storage memory 8 used to store the output measured-value information D1; a RAM 9 used to store a reference value corresponding to each measured-value information D1; and a control part 5 used to decide whether each measured value stored in the storage memory 8 or a mean value of a plurality of measured values to be output continuously in a time-series manner satisfies a set condition or not with respect to the reference value stored in the RAM 9.