A passenger restraining harness has a web (30) which during ready position stored within the backrest of a seat (10) and there is also a headrest (31) rested on top of the backrest covering the exit opening of the web, during the course of an accident, the propelling device (50) will receive commend from the sensor to propel carrying cams (80) (801)(802)(803) with the web and headrest along the looped channels (40) to the engaged positions at the anchor brackets (60) effectively restraining a person (11), the cable guides (20) with the tightening cable (32) function together to tighten up middle section of the web (30). Showing is the inside section of a vehicle (9).