A weather strip includes a bottom wall that faces or is in contact with an end face of a fixed window glass that closes a window opening of a side door. An outer wall extends from the bottom wall on an outer side of the vehicle body with respect to the fixed window glass, and an inner wall extends from the bottom wall on an inner side of the vehicle body with respect to the fixed window glass so that the inner wall and the outer wall sandwich a peripheral portion of the fixed window glass in a thickness direction. The inner wall is provided with a spacing groove for creating a space between the fixed window glass and the inner wall.