Abstract: A plastic clamp for an elongated body includes a pair of opposed side walls and a bottom wall extending between the side walls so as to define a pair of end openings and an upper opening, an engaging piece extending in an inclined manner from an upper portion of at least one of the side walls toward a lower portion of the opposed side wall, and a resilient supporting piece provided upon an inside surface of at least one of the side walls so as to extend from one of the end openings to the other end opening and have a distal end thereof positioned close to the opposed side wall.