Mounting structure of seaming welt member, sensor, and weather strip

A mounting structure of a seaming welt member used for mounting the seaming welt member to a flange of an automobile, wherein

• the seaming welt member includes a first side wall portion disposed on one side in a thickness direction of the flange, a second side wall portion disposed on the other side in the thickness direction of the flange, a connecting wall portion that extends in the thickness direction of the flange and connects the first side wall portion and the second side wall portion, and a first holding lip and a second holding lip that are provided on an inner surface of the first side wall portion,
• the first holding lip is configured such that a root portion thereof is connected to the inner side of the first side wall portion via a thin wall portion and is in an inclined attitude in which the first holding lip gets closer to the second side wall portion as proceeding to a deep side in an insertion direction of the flange, and
• the second holding lip is positioned further on a near side in the insertion direction of the flange than the first holding lip, is configured to have a bent shape located separated from the root portion of the first holding lip to the near side in the insertion direction of the flange when the flange is not inserted and, on the other hand, during insertion of the flange, be deformed from the bent shape into an elongated shape due to a pressing force by the flange, and is configured such that, when insertion of the flange is completed, a tip end portion thereof engages between the root portion of the first holding lip and the inner surface of the first side wall portion.