The electromagnetic wave detector is configured to apply an operating voltage to p-type and n-type graphene juxtaposed on an insulating layer, a first electrode and a second electrode opposed to each other with the graphene interposed therebetween, and p-type and n-type graphene. Including a gate electrode to be applied, a balanced circuit and a detection circuit connected between the two second electrodes, p-type graphene has a Dirac point voltage higher than the operating voltage, and n-type graphene is In a state where the Dirac point voltage is lower than the operating voltage and no electromagnetic wave is incident on the graphene, the balanced circuit makes the first electrode and the second electrode the same potential, and the electromagnetic wave is incident on the p-type and n-type graphene. Thus, the detection circuit detects an electric signal between the second electrodes and outputs an electric signal in a state where an electromagnetic wave is incident.
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