To provide a winding and unwinding drum automatically executing the enlargement or contraction of the outer diameter of a mandrel and the contraction of the outer diameter for pulling out a winding coil.

A mandrel 1, plural two-stage extending and contracting type cylinder 2 which is constituted in the radial direction of the mandrel 1, and a segment 4 which covers the outer periphery of the mandrel with plural numbers of members extending in the axial direction of the mandrel 1 and enlarges or contracts in the radial direction of the mandrel 1 with the cylinder 2 are prepared. An auxiliary cylindrical space 9, wherein an auxiliary piston 10 provided in the tip end of the rod 3 of the cylinder 2 is slid, is provided in the segment 4, and an auxiliary cylinder 5 is composed of the auxiliary cylindrical space 9, the auxiliary piston 10 and the rod 3 of the cylinder 2.