Patent attributes
A vehicle side portion structure includes a front side door and a rear side door of a vehicle that does not have a center pillar. A lock member is disposed at a vertical direction lower portion of one side door of the front side door and the rear side door. When the one side door is closed, the lock member engages with the other side door to lock the one side door. A reinforcement member is provided inside the one side door at the vertical direction lower portion. A part of the reinforcement member is disposed on an upper side of the lock member so that the lock member is surrounded by the reinforcement member and the peripheral edge portion of the one side door as seen in a side view of the vehicle.