There is provided a communication device including a transmission unit configured to transmit a modulated signal obtained by performing frequency conversion to convert a baseband signal output by a first electronic device into a signal with a higher frequency band than the baseband signal, using a waveguide as a transmission path, and a detection target mechanism corresponding to a mechanism included in a second electronic device that receives the baseband signal output by the first electronic device, the detection target mechanism being configured to be connected to the first electronic device and to be detected by the first electronic device when the first electronic device and the second electronic device are connected.