To provide a method of handling residual web paper when processing paper.

In this residual web paper handling method for handling a web paper left in a core, the core in which the web paper is left is set in a fixed chuck core of the handling device, and a part formed into a movable chuck core to be moved on a slide rail on the opposite side so as to correspond to various core length is put to the core, and positioning is performed in the closest set hole by a lock pin, and strongly fixed by a quick lock, and thereafter, the residual paper is cut by a paper cutting means, and eliminated from the core. The residual web paper handling device has a fixed chuck core for holding one end of the core, a movable chuck core for holding the other end of the core, a movable chuck core moving means for holding the movable chuck core and placed on the slide rail so as to move along the rail, a lock pin for fixing the movable chuck core moving means, and a quick lock for strongly fixing the core.