There are provided a hinge pillar having a closed-cross section extending in a vehicle vertical direction, a side door body comprising a door outer and a door inner, a door trim provided to cover the door inner from a cabin inside, and a stay damper arranged between the door inner and the door trim such that the stay damper extends rearwardly from a front end thereof which is attached to the hinge pillar and to a rear end thereof which is attached to the door inner.