Seal structure for door of automobile

A seal structure for an automobile door havig a side door (21) and a roof opening for a roof door (23). The seal structure comprises a door weather strip (30) mounted on said side door (21) for sealing a space between said side door (21) and the roof door (23) when the doors are closed. A tangent (140) on a contact part (80) on which a hollow seal member (32) of the weather strip (30) mounted on the side door (21) first touches the roof door (23) is a straight line which divides an angle (¸2) on an acute angle side between an advancing locus (110) of the side door (21) and an advancing locus (120) of the roof door (23) into a substantially half angle (¸1), the two advancing loci intersecting on the contact part (80).