PRINTED WIRING BOARD FOR HIGH FREQUENCY TRANSMISSION

A printed wiring board 1 for high frequency transmission according to an embodiment of the present invention includes: an insulating base material 10; a signal line 21 extending in a longitudinal direction of the insulating base material 10; ground wirings 31, 32 extending in the longitudinal direction while being spaced apart from the signal line 21 by a predetermined distance; a ground layer 40 formed on a major surface 10b; a plurality of ground connection vias 51 electrically connecting the ground wiring 31 and the ground layer 40; and a plurality of ground connection vias 52 electrically connecting the ground wiring 32 and the ground layer 40. A width of the ground wirings 31, 32 is smaller than a land diameter of the ground connection vias 51, 52. Then, the ground connection vias 51 and the ground connection vias 52 are arranged not to overlap each other in a width direction perpendicular to the longitudinal direction throughout a cable portion 90.