Electromagnetic wave discharge emission device

[Problem] To provide a small electromagnetic wave discharge emission device that generates discharge solely via an electromagnetic wave, such that the lengthwise dimension of the device can be greatly reduced, and the device can emit an electromagnetic wave on a target space in accordance with the output of a supplied electromagnetic wave. [Solution] An electromagnetic wave discharge emission device is provided with: an electromagnetic wave oscillator MW that oscillates an electromagnetic wave; a control device 2 that controls the electromagnetic wave oscillator MW; a first substrate 10, on the main surface side of which a plurality of discharge emission patterns 11 are formed; and a second substrate 20, on which is formed a power feeding pattern 22 that has a power receiving port 21, which receives a power supply of an electromagnetic wave from the electromagnetic wave oscillator MW, and power feeding terminals 22a, which are connected, via holes, to power receiving terminals 11a of the discharge emission patterns 11, such that the power receiving port 21 is equidistant to each of the power receiving terminals 11a, which are the points where the discharge emission patterns 11 receive power, wherein each discharge emission pattern 11 forms a spiral around a power receiving terminal 11a connected to the power feeding pattern 22, and has a length equal to 1/4 of the wavelength of the supplied electromagnetic wave.