Radio wristwatch

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.