A step portion (44S) that is farther toward a vehicle width direction outside than a cabin inside vertical wall portion (44A), is set on a door inner panel (44). A portion of the step portion (44S) is a first overlapping portion (44R) that is arranged in a position overlapping with an outside vertical wall portion (18A) of a center pillar (18) in a vehicle side view. A portion of the outside vertical wall portion (18A) of the center pillar (18) is a second overlapping portion (18R) that faces the first overlapping portion (44R) at a distance that is narrower than a distance between the step portion (44S) and the cabin inside vertical wall portion (44A). A third overlapping portion (60X, 60Y) that is connected to the first overlapping portion (44R) in a position overlapping with the second overlapping portion (18R) of the center pillar (18) in the vehicle side view, is set on an end portion of a beltline reinforcement (60) in a length direction thereof.
