PURPOSE: To obtain an excellent antenna characteristic immune from radio wave interference and to obtain a window glass antenna provided with an electronic key system antenna suitable for space saving with ease of design and manufacture by forming the electronic key system antenna for an automobile independently of other radio reception antenna and a defrosting heater formed on the window glass of an automobile.

CONSTITUTION: An electronic key exclusive use antenna 5 arranged on an outer circumference of a window glass 2 is formed on a window glass 2 on which a heater wire 3 and a radio reception antenna 4 are formed. Or the electronic key exclusive use antenna 5 coping with plural reception frequencies is formed by arranging antenna elements along an outer circumference of the window glass 2 clockwise/counter clockwise.