Patent ID: 8345514

Claim:
A radio-controlled timepiece, comprising: an antenna core made of a magnetic material and formed as a single integrated body including a coiled portion wound with a coil and an extension portion that is located closer to an end portion than the coiled portion is; an additional core made of a magnetic material; a timepiece substrate made of a non-magnetic material; a guide member made of a non-magnetic material, the guide member being separate from and non-integrated with the additional core; and a pressing member made of a non-magnetic material, wherein: the timepiece substrate includes an antenna supporting portion supporting the antenna core substantially within a plane of the timepiece substrate, the guide member includes an additional core-supporting portion supporting the additional core so that the additional core rises up in the thickness direction of the timepiece, and the pressing member biases the additional core towards the extension portion of the antenna core so that a first end face of the additional core comes into contact with the extension portion of the antenna core.