PURPOSE: To provide shield structure capable of shielding without generating intermodulation.

CONSTITUTION: An upper case 21 is engaged with a lower case 12 by a contact spring part 11b, and a shield case 10 is formed. An RF module board 14 having a variable resistor 14a for adjusting is accommodated in the shield case 10, and an RF module 15 is formed, which is fixed in a hole part 13a for fixing in a printed board 13. A shaft 22a is held in a shaft hole 21a in the surface 21b of the upper case, so as to be able to turn. A fan-shaped shield plate 22 is fixed to the lower end portion of the shaft 22a, and can close a hole 11a for adjusting the variable resistor. When the upper end portion of the shaft 22a is turned, the shield plate 22 is turned, and the hole 11a is opened. The variable resistor 14a can be adjusted by inserting a driver into the hole 11a for adjusting, in the state that the shield case 10 is assembled. Since the hole 11a is normally closed, shield structure which prevents electromagnetic waves from permeating into the RF module and generating intermodulation can be obtained.