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;
• an inner skeleton part formed on the inner panel so as to be coupled to the outer peripheral skeleton part with a step inside the outer peripheral skeleton part;
• and
• a stiffening plate that overlaps a connecting portion between the outer peripheral skeleton part and the inner skeleton part, wherein
• the stiffening plate includes an outer junction, an inner junction, and a connecting stiffening plate portion between the outer junction and the inner junction,
• the outer junction overlaps the outer peripheral skeleton part, and is joined to the inner panel at the outer peripheral skeleton part,
• the inner junction is joined to the inner panel at a portion inward from the inner skeleton part, and
• the connecting stiffening plate portion is joined to the inner panel at the inner skeleton part.