There is provided an infrared light emitting device that is capable of polarizing emission light without causing loss of the emission light and having a simple configuration. Included are a photoconductive layer 22 which generates optical carriers upon being irradiated with pulsed excitation light; a pair of first antenna electrodes 21a for emitting infrared light, which are formed on the photoconductive layer 22 with a gap 32 disposed between tips thereof; a pair of second antenna electrodes 21b for emitting infrared light, which are formed on the photoconductive layer 22 and which are disposed with the gap 32 between tips thereof and having an angle with respect to the first antenna electrodes 21a; and a control unit for independently applying voltages to the first antenna electrodes 21a and the second antenna electrodes 21b. The voltage applied to the first antenna electrodes 21a and the voltage applied to the second antenna electrodes 21b may be selectively applied at different times or may be simultaneously applied with different phases.
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