KNEE PROTECTION AIRBAG DEVICE

A knee protection airbag device is provided with an airbag, an inflator, an airbag cover, and an attachment base to be connected to a vehicle body side member. The airbag cover includes a door portion that allows forming of a protrusion-permitting opening when pushed by the airbag that inflates, a door disposition wall portion that covers a lower portion of the airbag in a folded state, and connecting wall portions that extend upward from front and rear edges of the door disposition wall portion and that are connected to the attachment base. The airbag cover defines an accommodating recess capable of accommodating the airbag that is formed by bending a portion of the recessed grooves for bending that are formed by performing press working on a sheet member made of a non-woven fabric.