Wiring board, electronic component mounting package including wiring board, and electronic module

A wiring board comprising:

• a first insulating layer including a first upper surface and a first lower surface opposite to the first upper surface;
• a second insulating layer positioned on the first insulating layer and including a second upper surface and a second lower surface opposite to the second upper surface;
• a first ground conductor including a first opening and at least one second opening, and positioned on the first lower surface;
• and
• a first signal conductor including a first line positioned on the first upper surface and a second line positioned on the second lower surface;
• wherein
• the first line includes a first end portion and a first line portion extending from the first end portion,
• the second line includes a second end portion electrically connected to the first end portion, and a second line portion extending from the second end portion, in a planar view,
• the first end portion and the second end portion are positioned in the first opening,
• at least part of the second line portion is positioned to be overlapped with the second opening, and
• the first opening is larger in area than the second opening.