A roof weather strip (16) includes a fitting base part (21) and a seal part (22) having a hollow part. The seal part has a sealing wall (25) which is configured to be brought into pressure contact with a peripheral part of a roof panel forming a roof opening, when a movable roof closes the roof opening. The seal part also has an upper connecting region (26) so as to connect the sealing wall to an upper part of the fitting base part. The upper connecting region is provided with a corrugated part (27) on its inner face opposed to the hollow space, and the corrugated part has a plurality of convex parts (28) and concave parts (29) which are alternately formed. An arm part (31) is integrally formed so as to extend from the fitting base part downward at an outer peripheral side, and a distal end of the arm part is connected to a lower end of the seal part. Because a plurality of the concave parts of the corrugated part exist in the upper connecting region, stress is easily dispersed.