Safety belt apparatus for vehicle

A safety apparatus is installed in a vehicle provided with an air bag system having an air bag which is housed, when empty, in a container in front of a driver's seat. The air bag is inflated to protect the driver during a collision. The safety apparatus is provided with an impact diminishing mechanism for preventing a shoulder belt from being increasingly tensioned by the body of the driver any time before the inflated air bag acts on the driver with a maximum impact.