A motorized roller is provided, in which processing of the power transmission section thereof can be performed simply and with good productivity, and the processing precision can also be improved. The motorized roller includes a motor and a reducer which are disposed inside a roller body. Rotations of the motor are reduced by the reducer and transmitted to the roller body. In this motorized roller, a rotor connected to the roller body so as to transmit power of the reducer to the roller body is disposed inside the roller body, and the roller body is configured to be divided at a power transmission section thereof between the rotor and the roller body.