A housing, a handheld device and a manufacturing method of a housing are provided. The housing includes a body, a metal antenna layer, and a conductive element. The body includes a through hole and an outer surface and an inner surface opposite to the outer surface. The metal antenna layer is disposed on the outer surface and covers the through hole, wherein an edge of the metal antenna layer is connected to the outer surface seamlessly, and a surface of the metal antenna layer is at least partially exposed by the body. The conductive element is disposed in the through hole and directly contacts the metal antenna layer to transmit signals received by the metal antenna layer.