The seatbelt device of a vehicle comprises at least two seatbelt mechanisms including the webbings (21,22) and the first pre-tensioner mechanisms (25,26) operative to wind up the webbings so as to apply the specified tension to the webbings when the crash pre-detecting device (6) detects the vehicle crash in advance, and the control device (37) to control the seatbelt mechanism, wherein there is provided the vehicle turning control device (35) which operates to control the braking force of the brake device of the vehicle so that the vehicle turning state can be the target turning state, and the control device (37) operates at least the two first pre-tensioner mechanisms (25,26) when the vehicle turning control device operates. Accordingly, the pre-tensioner mechanisms (25,26) operate additionally when the Dynamic Stability Control (DSC) operates, thereby increasing restraint force of the passengers and improving the safety of the passengers.