Inner shuttering section for the erection of a construction section

An inner formwork section for constructing a building section (4) with a circumferentially closed concrete wall (42) whose circumference increases or decreases over the height of the building section (4) comprises a circumferentially closed main section (5) whose circumference is greater or smaller at its upper end at its lower end, and one at the upper end of the main part (5) releasably attached to this climbing ring (6). The main part (5) has a plurality of circumferentially adjoining, detachably interconnected strip elements (9), at least some of which have increasing or decreasing widths over their height.