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This paper describes the design and verification of a sliding mode observer to estimate the state information of the angular velocity and load torque for a motorized seat belt (MSB) system. The MSB system is a type of active safety system which provides functions to protect passengers and improve passenger convenience. To realize the full range of operations of a MSB system, several types of state information such as the motor current, angular velocity and load torque of the DC motor, the seat belt winding velocity and the position and temperature of the DC motor are necessary. Measuring this state information with sensors leads to an increase in both the system cost and its complexity. Furthermore, it is difficult to measure the load torque of a DC motor, which must be done in order to realize the full range of MSB functions.