A radio-wave receiver is provided with a hollow-cylindrical case, a plate-like module member accommodated within the cylindrical case, a transparent member closing one opening end of the cylindrical case, a cover closing the other opening end of the cylindrical case, and an antenna structure disposed on the side position of the plate-like module member. The antenna structure is provided with a core including a plurality of plate-like magnetic members layered on each other in a direction perpendicular to the thickness direction of the plate-like module member, a coil wound around a central straight part of the core, and bent end portions extending from both ends of the core and bent to conform to the inner periphery of the cylindrical case.