PROBLEM TO BE SOLVED: To provide a waveform display device that enables any range of a waveform displayed on a display screen to be designated by a simplified operation.SOLUTION: A waveform display device 10 comprises: a touch panel 16 that can detect a contact position on a display screen 17; a measurement data storage section 22 that stores measurement data; waveform display process means 30 that reads the measurement data from the measurement data storage section 22, and displays a waveform W1 based on the measurement data on the display screen 17; determination area setting means 31 that sets a slide portion of the contact position on the display screen 17 as a determination area 5; selection range determination means 32 that determines a range of the waveform W1 corresponding to the determination area 5 as a selection range of the waveform; and process execution means 33 that executes a storage process with respect to the selection range of the waveform W1.
