Weather strip for motor vehicle

A weather strip including a trim portion for holding a flange provided around an opening portion of a vehicle body of a motor vehicle, or a closing member for closing the opening portion, and a sealing portion for contacting and sealing a facing member, wherein

• said trim portion has an outer side wall, an inner side wall and a bottom wall with a generally U-shaped cross-section, said trim portion has an outer holding lip formed to extend from an interior surface of said outer side wall, and an inner holding lip formed to extend from an interior surface of said inner side wall, an insert formed by processing a band-shaped metallic plate is embedded in the trim portion,
• said insert includes a large number of insert pieces, each having a rectangular configuration and extending in a width direction of said band-shaped metallic plate, said insert pieces are joined with joining parts in a longitudinal direction of said band-shaped metallic plate in the vicinity of ends of said insert pieces into a ladder-shaped configuration, said insert pieces define slits between adjacent insert pieces, and widthwise centers of said joining parts are located away from parts facing a base of said outer holding lip and a base of said inner holding lip towards said ends of said insert pieces.