Patent ID: 7126880

Claim:
A radio wave wristwatch comprising: a wristwatch case constructed by integrally combining three elements in a lapped manner, said three elements being a metal annular base, a metal annular window frame positioned on the surface side of said metal annular base to fringe a transparent window plate, and a metal annular case back cover frame positioned on the back surface side of said metal annular base to fringe a nonmetal back cover plate; a nonmetal dial plate disposed in said wristwatch case so as to face said transparent window plate; and a movement with a built-in antenna disposed between said nonmetal dial plate and said nonmetal back cover plate, the height of the movement with built-in antenna being approximately equal to the thickness of the antenna; wherein the dimensional relationship between said metal annular base and said movement with a built-in antenna is determined so that the height of said metal annular base is smaller than the height of said movement with a built-in antenna, and the upper and/or lower outer peripheries of said movement with a built-in antenna which project vertically from said metal annular base are surrounded by a lower extension of said metal annular window frame and/or an upper extension of said metal annular back cover frame.