Rear gate structure of vehicle

A rear gate structure of a vehicle, the rear gate structure being configured to open and close a rear opening of a vehicle body of the vehicle, the rear gate structure comprising:

• an outer panel constituting an outer surface of the vehicle by the rear gate;
• an inner panel provided inside the vehicle with respect to the outer panel, at least an outer peripheral edge of the inner panel being joined to the outer panel;
• an outer peripheral skeleton part formed on the inner panel along an outer peripheral edge of the inner panel;
• and
• a stiffening plate that overlaps the outer peripheral skeleton part, wherein
• the stiffening plate
• has a curved long plate shape having an outer shape that is provided so as to overlap an upper corner portion of the outer peripheral skeleton part and is curved along the upper corner portion of the outer peripheral skeleton part, and
• is provided with a curved recess that is formed by curving, in a recessed shape, a portion surrounded by a frame part, the frame part comprising a curved upper edge junction curved at an upper edge in the curved long plate shape, a curved lower edge junction curved at a lower edge in the curved long plate shape, and an outer edge connecting surface portion and an inner edge connecting surface portion serving as both edges in a longitudinal direction in the curved long plate shape,
• the curved upper edge junction is joined to an outer adjacent portion of the inner panel adjacent to the outer peripheral skeleton part, at least in a portion on an extension of the outer edge connecting surface portion and a portion on an extension of the inner edge connecting surface portion, and
• the curved lower edge junction is joined to an inner adjacent portion of the inner panel adjacent to the outer peripheral skeleton part, at least in a portion on the extension of the outer edge connecting surface portion and the portion on the extension of the inner edge connecting surface portion.