The integrated device of a heat dissipation unit and a package component includes a non-insulation type package component, an insulation sheet, a heat dissipation unit, a fastener, a washer and a sleeve. The non-insulation package component has a metal tab with a through hole. The insulation sheet is provided with a via hole and attached on one side of the metal tab. The heat dissipation unit is provided with a tapped hole corresponding to the through hole. The sleeve includes a narrow portion penetrating the via hole and through and a wide portion sandwiched between the insulation sheet and heat dissipation unit. When the fastener penetrates into the through hole of the metal tab and the via hole of the insulation sheet and screws into the tapped hole, the fastener will pass through the sleeve without contact with the insulation sheet due to the protection of the narrow portion in the via hole.