A weather strip mounted along a circumferential edge of a door opening of an automobile body, the weather strip comprising: an installation base member having a substantially U-shape in cross-section, including an outer-cabin side wall, an inner-cabin side wall and a bottom wall which connects the side walls (31, 32); and a hollow seal member provided on an outer-cabin side of the installation base member, said hollow seal member making elastic contact with a protrudingly curved surface having a substantially U-shape in cross-section, which is protrudingly provided toward an inner-cabin side from said door; wherein: said hollow seal member includes a first hollow wall and a second hollow wall which are connected with each other, said first hollow wall being bent into a substantially reversed V-shape in cross-section around a first bent point and said second hollow wall being bent into a substantially V-shape in cross-section around a second bent point; one end of said first hollow wall is connected around an end part of the outer-cabin side wall of said installation base member and one end of said second hollow wall is connected to a part determined by protruding toward an outer-cabin side from a part on the bottom wall side of the outer-cabin side wall of said installation base member, descending substantially in parallel with the outer-cabin side wall and further protruding toward said bottom wall side; an interval between one end of said second hollow wall and the second bent point is a vertical wall vertically formed toward the outer-cabin side and an interval between said second bent point and another end of the second hollow wall is a seal wall; the other end of said second hollow wall has a protrusion provided in succession to said seal wall, said protrusion making elastic contact with the protrudingly curved surface of said door together with the seal wall; and another end of said first hollow wall is connected with the inner side of said hollow seal member, which is on the other end of said second hollow wall while said protrusion protrudes toward the outer-cabin side, characterized in that the seal wall makes elastic contact with the protrudingly curved surface of the door and which is swelled and curved toward an inner side of said hollow seal member, even before making elastic contact with the protrudingly curved surface of said door. said hollow seal member includes a first hollow wall and a second hollow wall which are connected with each other, said first hollow wall being bent into a substantially reversed V-shape in cross-section around a first bent point and said second hollow wall being bent into a substantially V-shape in cross-section around a second bent point; one end of said first hollow wall is connected around an end part of the outer-cabin side wall of said installation base member and one end of said second hollow wall is connected to a part determined by protruding toward an outer-cabin side from a part on the bottom wall side of the outer-cabin side wall of said installation base member, descending substantially in parallel with the outer-cabin side wall and further protruding toward said bottom wall side; an interval between one end of said second hollow wall and the second bent point is a vertical wall vertically formed toward the outer-cabin side and an interval between said second bent point and another end of the second hollow wall is a seal wall; the other end of said second hollow wall has a protrusion provided in succession to said seal wall, said protrusion making elastic contact with the protrudingly curved surface of said door together with the seal wall; and another end of said first hollow wall is connected with the inner side of said hollow seal member, which is on the other end of said second hollow wall while said protrusion protrudes toward the outer-cabin side, characterized in that the seal wall makes elastic contact with the protrudingly curved surface of the door and which is swelled and curved toward an inner side of said hollow seal member, even before making elastic contact with the protrudingly curved surface of said door.