Abstract: A printed circuit board includes: a first insulating layer; a cavity unit including a first cavity penetrating through a portion of the first insulating layer from an upper surface thereof in a thickness direction, and a second cavity penetrating through another portion of the first insulating layer from the first cavity; a first wiring layer disposed at an upper side of the first insulating layer; a second wiring layer disposed at a lower side of the first insulating layer; and a third wiring layer at least partially buried in the first insulating layer and disposed on a level between the first and second wiring layers in the thickness direction. The third wiring layer includes pads in which at least a portion of each of upper surfaces thereof is exposed from the first insulating layer through the cavity unit, and the first cavity has a wider cross-section than the second cavity.