To provide a power display part at a section that is easy to see, independently of a tap body, by making them into a separate constitution.

The power source tap is provided with a tap body 10 connected with the commercial power source and provided with electrical output sockets 12 to be inserted with power source plugs of electrical equipment, and an electric power display part 20 to be installed at a place different from that of the power source tap 10. The tap body 10 is equipped with a power detection part 13 for detecting the consumed power supplied from the power output socket 12 to the electrical equipment and a radio transmitter part 14 for transmitting radio signal modulated by the consumed electric power detected by the detection part 13. The electric power display part 20 is equipped with a radio receiver part 21 for receiving and demodulating the radio signal transmitted from the radio transmitter part 14 and a display means 22 for displaying the consumed electric power demodulated by the radio receiver part 21.