To seal between the door sash of a front door and a center pillar and between the door sash of a rear door and the center pillar while preventing seal members from being damaged in simple structure.

Seal members 4 are attached to seal between the door sash 15 of a front door 2 and a center pillar 1 and between the door sash 22 of a rear door 3 and the center pillar 1 and are provided with a first seal section 27 on which the door sash 15 positioned in the rear section of the front door 2 abuts overlapped in the longitudinal direction of the car body when the front door 2 closes and a second seal section comprising a rear wall section 28 on which the door sash 22 positioned in the rear section of the front door 3 abuts overlapped in the longitudinal direction of the car body when the front door 3 closes.