Seatbelt device for vehicle

A control method of a seatbelt device for a vehicle having:

• a belt reel having webbing wound thereon;
• a position detection device that detects a winding position of the belt reel;
• and a motor that drives the belt reel to rotate to thereby perform winding of the webbing, the control method comprising:
• a step of performing electric current conduction to the motor at a predetermined electric current conduction amount during a predetermined period of time from a moment at which a rear vehicular collision occurs or a rear vehicular collision is predicted;
• a step of determining, during the predetermined period of time, whether or not the belt reel has reached a predetermined winding position, based on detection results from the position detection device;
• a step of monitoring positional variation in the belt reel after the belt reel has reached a predetermined winding position;
• and
• a step of changing the amount of electric current conduction to the motor based on the positional variation.