Airbag and airbag apparatus

An airbag comprising:

• a front chamber to which gas is supplied with the front chamber having a front end thereof;
• and
• left and right spaced chambers communicating with the front chamber, and receiving gas from the front chamber, to be inflated on left and right sides in front of an occupant, respectively, the left chamber having a distal rear end and the right chamber having a distal rear end with the distal rear ends being spaced from each other when the airbag is inflated,
• wherein, in a state in which the airbag is inflated, a central recess is provided extending forwardly from between the spaced distal rear ends of the left and right chambers toward the front chamber to a forward edge of the recess with the left and right chambers being completely spaced from each other across the recess from the recess forward edge to the spaced rear distal ends thereof without any connecting members extending across the recess between the chambers, the central recess continuously vertically extending from an upper surface of the airbag to a lower surface of the airbag between the left and right chambers,
• wherein a tether belt is provided in the airbag for pulling at least one part of the deepest part of the recess to the inside of the airbag, and
• wherein the tether belt has opposite ends that are both directly connected to the airbag including an upper end connected at the recess forward edge and a lower end connected at or slightly forwardly of the recess forward edge spaced rearwardly from the front end of the front chamber, with one of the upper and lower ends of the tether being rearward of the other of the tether ends.