A printed circuit board (PCB) includes a substrate base including at least two chip attach regions spaced apart from one another, a plurality of upper pads disposed in the at least two chip attach regions of the substrate base, an accommodation cavity overlapping a part of each of the at least two chip attach regions and recessed in an upper surface of the substrate base, and at least one spacing groove recessed in the upper surface of the substrate base. The at least one spacing groove is connected to the accommodation cavity, and extends in a region between the at least two chip attach regions.