A package device is provided and includes a redistribution layer. The redistribution layer includes a first dielectric layer, a second dielectric layer, and a conductive layer. The second dielectric layer is disposed on the first dielectric layer, and the second dielectric layer includes a dielectric pattern. The conductive layer is disposed between the first dielectric layer and the second dielectric layer, and the conductive layer includes a first conductive pattern. The dielectric pattern has a through hole, and in a top view of the package device, the first conductive pattern and the through hole are overlapped with each other.