Air bag

In order to provide an air bag comprising a left half air bag, a right half air bag, and a tie panel connecting the occupant-side front ends of the left and right half air bags to securely catch the occupant and sufficiently absorb the impact inflicted to the occupant, an air bag (10) comprises a left half air bag (12) to be inflated to the front left side of an occupant; a right half air bag (14) to be inflated to the front right side of the occupant; a tie panel (16) connecting the left and right half air bags (12) and (14). The left and right half air bags (12, 14) have an inflator opening (18) in the rear ends thereof opposite to the occupant, respectively. The left and right half air bags (12, 14) are arranged such that the respective inner panels (20) contact each other in case of expansion thereof.