An unbalanced shaft (1) for compensating inertial forces and / or moments of inertia for a reciprocating internal combustion engine includes at least one shaft section (2,4,6) and a bearing journal (10,12) adjacent to the at least one shaft section (2,4,6) and an unbalance mass (8) disposed on the shaft section (2,4,6). The bearing journal (10,12) is formed from at least two parts including a first solid bearing segment (18,20) and a second solid bearing segment (22,24), and a center of gravity of the shaft section (2,4,6) and the bearing journal (10,12) is eccentric to an axis of rotation (D) of the unbalanced shaft (1). The first solid bearing segment (18,20) includes a portion projecting into the second solid bearing segment and the second solid bearing segment (22,24) include a portion projecting into the first solid bearing segment such that the first and the second solid bearing segment are secured at least axially relative to each other.