Head protecting airbag device

A head protecting airbag device to be mounted on a vehicle including:

• a side window positioned on the side face of the vehicle, a rear wall portion arranged on the rear side of said side window;
• and a pillar portion arranged on the front side of said side window, wherein said rear wall portion is arranged to intersect said side window generally perpendicularly, and wherein said pillar portion is arranged to extend generally vertically, comprising:
• an airbag folded and housed on the upper edge side of said side window on the interior side so that it can cover said side window when extending and expanding,
• wherein said airbag is mounted at its two longitudinal ends on the vehicle body so as to develop a longitudinal tension when the airbag is extending and expanding,
• wherein said airbag is mounted at its front side leading end on said pillar portion, and
• wherein said airbag is mounted at its rear side leading end at a position of said rear wall portion spaced from said vehicle side face;
• and
• guide means arranged near a corner portion between said rear wall portion and said vehicle side face so as to guide the downward protrusion of said airbag when the airbag is extending and expanding and to regulate the movement of said airbag at said corner portion to the interior side upon completion of the extension and expansion.