A grommet is fit on a pipe harness formed by inserting a wire harness into a metallic pipe. The grommet has a small-diameter tube configured to allow insertion of the pipe harness therethrough in a tight manner. The small-diameter tube has an inner diameter B obtained by adding an allowable tolerance dimension α to an outer diameter A of the pipe. Two annular ribs project from an outer peripheral surface of the small-diameter tube on the side of a distal end opening and a band winding portion is interposed between the annular ribs. An annular sealing lip projects from an inner peripheral surface of the small-diameter tube at an inner position displaced from a position corresponding to the band winding portion. The sealing lip has an inner diameter C obtained by subtracting the allowable tolerance dimension α from the outer diameter A of the pipe.