An adjustment device (1) for adjusting the relative rotational angle position of a camshaft (2) in relation to a crankshaft of an internal combustion engine is provided, with the device having an adjustment mechanism (3), which is embodied as a triple-shaft transmission and provided with an input part (4) fixed to the crankshaft, an output part fixed to the camshaft, and an adjusting shaft (7) connected to an adjusting motor shaft (5) of an adjusting motor (6). The motor (6) is provided as an electric motor and is spatially separated from the adjusting shaft (7), and the torque produced thereby is transmitted to the adjusting shaft (7), either mechanically via a flexible shaft (8), pneumatically via a compressor (9) operating a pneumatic motor (13) using pressurized air, or hydraulically via a hydraulic motor (16) and a pump (14) providing the hydraulic medium. The adjusting motor (6) can also be arranged parallel to the adjusting shaft (7) or radially in relation thereto, and the torque is transmitted by toothed gearing or a secondary drive.