A head protecting airbag device includes: an airbag configured to cover a window of a vehicle; a winding band wound around a folded body which is formed by folding the airbag, the winding band including: an attachment portion being pressed and locked to an attachment target portion; a band body wound around the folded body; an engaging claw portion formed at one end of the band body; and an engaging target portion disposed at the other end of the band body; and a pressing portion, having a pressing operation surface configured to press-fit the engaging claw portion into an engaging concave portion, disposed at a claw-side end of the band body, wherein the attachment portion is disposed at a concave-side end of the band body so that the press-fit direction to the attachment target portion at the time of locking is substantially perpendicular to the pressing operation surface.