Hood airbag device

A hood airbag device for a vehicle comprising:

• a door which is provided in a hood to cover an opening formed in the hood, and which pivots around a rear edge portion of the door, and is opened toward a rear of a vehicle in a vehicle fore-and-aft direction to uncover the opening;
• an inflator which is provided inside the hood at a position corresponding to the opening formed in the hood, and which is disposed such that a gas-injection port, through which gas is injected when a collision occurs, is positioned closer to a rear edge of the opening than to a front edge of the opening in the vehicle fore-and-aft direction;
• and
• an airbag which is provided inside the hood, which is inflated due to pressure of gas supplied from the inflator, and which passes through the opening in the hood, and is deployed toward an outside of the vehicle body, wherein:
• the airbag is disposed in a case which is provided inside the hood, and which is open toward the opening;
• a portion of the airbag, which is positioned above the inflator in a vehicle height direction, and a portion of the airbag, which is positioned ahead of the inflator in the vehicle fore-and-aft direction, are folded, and the portion of the airbag, which is positioned ahead of the inflator, is folded more times than the portion of the airbag, which is positioned above the inflator;
• the gas-injection port is provided integrally with the inflator, and the inflator is disposed at such a position that the inflator indirectly contacts an inside of a rear wall of the case in the vehicle fore-and-aft direction;
• and
• an attachment hinge is provided at the rear edge portion of the door, the attachment hinge including a first end attached to the door and a second end attached to the hood, the attachment hinge further including a first portion extending from the first end in the vehicle height direction and a second portion extending from the first portion toward the rear of the vehicle in the vehicle fore-and-aft direction, wherein the second end extends obliquely from the second portion toward a bottom of the vehicle.