The present invention aims to provide a delay device having an analog delay line adaptable to a plurality of frequencies with a less number of taps. The analog delay line has a maximum delay amount equivalent to a wavelength from over a ⅜ wavelength of a predetermined maximum wavelength of an input signal to under a 1 wavelength thereof. Tap intervals up to a delay point equivalent to ½ of a predetermined minimum wavelength of the input signal are different from tap intervals placed ahead of those. The maximum wavelength is a wavelength of a signal having a frequency of 2 MHz, for example, and the minimum wavelength is a wavelength of a signal having a frequency of 5 MHz, for example.