PURPOSE: To obtain a head shield with which even a person, other than an expert, can use a portable radio telephone in safety by setting the head shield between the head part and the transmission antenna of the portable radio telephone transmitting a radio wave within a specified distance from the head part.

CONSTITUTION: The radio wave shield 200 made of aluminum foil is set between the head part and the transmission antenna of a portable radio wave telephone transmitting a radio wave within 50 cm from the head part. The shield 200 is bonded to the inside of a cap 201 and intensively protecting the upper part 201a of ear opposing the antenna directly. This structure protects the head part against direct attack of radio wave radiated within a point-blank range thus protecting the head part of a user against the danger of tumor, or the like.