A substrate structure includes a first printed circuit board having a first side and a second side opposing each other, and a plurality of passive components connected to the first side of the first printed circuit board. The plurality of passive components includes a first group, including a plurality of first passive components disposed adjacent to each other, and a second group, including a plurality of second passive components disposed adjacent to each other. A smallest distance between the first and second groups is greater than at least one of a smallest distance between adjacent first passive components of the plurality of first passive components and a smallest distance between adjacent second passive components of the plurality of second passive components. An electronic device includes a first printed circuit board disposed on a mainboard and having, on opposite sides thereof, a semiconductor chip and a plurality of passive components.