To provide packing capable of surely blocking up a clearance between a sleeve and an insertion object.

This packing 4 is installed in an end part of the cylindrical sleeve 2, and blocks up the clearance between a protective pipe 31 inserted into the sleeve 2 and the sleeve 2, and has an outside cylindrical part 41 of a hollow cylindrical shape fitted to an outer peripheral surface of the sleeve 2, an inside cylindrical part 42 of a hollow cylindrical shape fitted to an inner peripheral surface of the sleeve 2, a connecting part 43 for connecting one end side of the outside cylindrical part 41 and one end side of the inside cylindrical part 42, and a plurality of annular wall parts 44 projecting toward the inside in the radial direction from the inner peripheral surface of the inside cylindrical part 42, mutually arranged at an interval in the axial direction of the sleeve 2 and having an insertion hole 44a for inserting the protective pipe 31.