A panel structure for a vehicle roof device includes a holder portion and a weather strip. The holder portion includes a fitting protrusion having a narrowed portion. The weather strip includes, in an integral manner, an attaching base and a sealing portion. The attaching base has a fitting recess fitted to the fitting protrusion. The attaching base includes a body portion in close contact with an outer side surface of the fitting protrusion, an upper attaching portion in close contact with an upper outer side surface of the narrowed portion, and a lower attaching portion in close contact with a lower outer side surface of the narrowed portion. The thickness of the upper attaching portion in the upper end is set to be larger in an upper area than in a lower area.