Head protection airbag device

1. A head protection airbag device comprising:

an airbag configured to cover a window of a vehicle at a time of deployment and inflation, and folded and stored at an upper edge side of the window on a vehicle inner side; and

a synthetic resin case configured to store a folding completed body of the airbag which is folded so that a lower edge side at a time of completion of inflation comes close to an upper edge side, wherein

the case includes a case body configured to cover the folding completed body at least from a vehicle outer side to an upper surface side, and a pressing piece formed to partially protrude downward from an upper edge side of the case body and formed to cover a vehicle inner side of the folding completed body,

the pressing piece has a band-like outer shape having a width direction substantially along a front and rear direction, and is configured to be able to press the folding completed body toward the case body so that the pressing piece can be bent with respect to the case body and the pressing piece can maintain a folded shape of the folding completed body, the pressing piece being formed substantially along a vehicle interior surface of the folding completed body,

a drain hole for molding is formed in a region of the pressing piece disposed on a vehicle outer side in the case body, and

a front edge side and a rear edge side of a peripheral edge of the drain hole constitute support surfaces capable of supporting the folding completed body.

2. The head protection airbag device according to claim 1 , wherein

the folding completed body has a substantially circular sectional shape, and

the pressing piece is configured so that a separation distance between a lower end and the case body is equal to or less than half of a diameter dimension of the folding completed body.