A turbine rotor having a plurality of rotor blades assembled into rotor blade rows and arranged on a turbine disk is provided. The respective turbine disc on the side surfaces thereof includes a plurality of sealing plates having edges that are arranged radially towards the inside, enables a simplified design and assembly, while maintaining maximum operational reliability and maximum efficiency of a turbine equipped therewith. Therefore, between the edge of the respective sealing plate and a side wall of the turbine disc groove, a closure member is provided, wherein the edge extends over the entire azimuthal length of the sealing plate and the closure members abut each other in the azimuthal direction for sealing purposes. The closure members may be inserted into the turbine disc groove via a recess interrupting the respective edge and extending substantially azimuthally on the side facing the turbine axis.