A semiconductor package includes a package substrate which includes a substrate base and a plurality of wiring patterns, a lower semiconductor chip, and an upper semiconductor chip. The substrate base includes a chip-accommodating cavity and the plurality of wiring patterns include a plurality of bottom wiring patterns on a bottom surface of the substrate base and a plurality of top wiring patterns on a top surface of the substrate base. The lower semiconductor chip is disposed in the chip-accommodating cavity and is connected to the plurality of bottom wiring patterns through a plurality of lower bonding wires. The upper semiconductor chip includes a first portion which is attached to the lower semiconductor chip and a second portion which overhangs the lower semiconductor chip.