The invention relates to a turbine blade (1), comprising: an airfoil (3) and a platform (2), which has an upper face (4) on which the airfoil (3) is arranged; and at least one lateral face (8), the lateral face (8) comprising a slot (10) for insertion of a sealing strip. The transition between the upper face (4) of the platform (2) and the at least one lateral face (8) comprises a stepped portion (13) and a beveled portion (14).