PURPOSE: To use one transmission line type antenna for multi-band by using a lumped constant coil so as to divide the conductor of the transmission line type antenna into plural parts and resonating the ground side from each split point to nearly 1/4 wavelength of a different frequency band.

CONSTITUTION: The length of a flat conductor 11-1 from a grounding point 13 is nearly 1/4 wavelength to a frequency f1 band, the conductor is resonated to the f1 band to transmit/receive a high frequency power from a feeding point 14 to a coaxial cable 15. Further, a part comprising a flat conductor 11-2, a lumped constant coil 16-1, and the flat conductor 11-1 is nearly 1/4 wavelength at the frequency f2 band and resonated to the f2 band to transmit/receive the high frequency power to the coaxial cable 15. Moreover, a part comprising a flat conductor 11-3, a lumped constant coil 16-2, the flat conductor 11-2 and the lumped constant coil 16-1 and the flat conductor 11-1 is nearly 1/4 wavelength to a frequency f3 band, resonated to the f3 band to transmit/receive a high frequency power to/from the coaxial cable 15.