PURPOSE: To provide an expandable heat-shrinkable tube, an expansion process or which is omitted, which can be manufactured stably and in which a shrinkage working temperature is lowered, shrinkage workhours are also shortened, heat resistance is improved and the outside diameter of the tube can be predicted when the tube is designed after shrinkage in the heat-shrinkable tube obtained.

CONSTITUTION: In a tube having two layer structure, in which a foam layer is formed to an outer layer and a non-foam layer to an inner layer, the foam layer as the outer layer is extrusion-molded while being expanded, and crosslinked.