A semiconductor package includes a semiconductor element, a capacitor, and a package substrate. The capacitor supplies transient current to the semiconductor element. The semiconductor element and the capacitor are mounted on the package substrate. The semiconductor element includes an integrated circuit, a first connecting part, and a second connecting part. The capacitor includes a third connecting part and a fourth connecting part. The package substrate includes a first metallic layer, a second metallic layer, and a dielectric layer. The first metallic layer includes a first conductive region, a second conductive region, a third conductive region, and a fourth conductive region. The first conductive region is connected via a fifth connecting part to the second metallic layer. The third conductive region is connected via a sixth connecting part to the second metallic layer. The second and fourth conductive regions are connected to each other inside the first metallic layer.