Knee airbag apparatus

A knee airbag apparatus comprising:

• an airbag cushion comprising a lower sheet portion, an upper sheet portion configured to overlap the lower sheet portion to form a cushion space together with the lower sheet portion, and a folded portion formed by folding the upper sheet portion so that portions of the upper sheet portion overlap partially;
• an inflator configured to supply a gas to the cushion space so that the airbag cushion is deployed;
• and
• a mouth tether positioned in the cushion space closer to a first end than a second end of the airbag cushion and comprising a first end coupled to the folded portion, and a second end coupled to the lower sheet portion,
• wherein the mouth tether comprises:
• a first mouth tether;
• and
• a second mouth tether comprising a first end coupled to the folded portion together with a first end of the first mouth tether, and a second end coupled to the lower sheet portion at a position different from a position at which a second end of the first mouth tether is coupled to the lower sheet portion,
• wherein the folded portion comprises a pair of folded piece portions defining a gap therebetween,
• wherein the first end of the first mouth tether and the first end of the second mouth tether are fitted into the gap and sewn to the folded portion by a sewed portion,
• wherein the second end of the first mouth tether is positioned closer to the first end of the airbag cushion than the second end of the second mouth tether, and
• wherein a length from the first end to the second end of the second mouth tether is shorter than a length from the first end to the second end of the first mouth tether.