A knee-bag to be inflated in front of an occupant leg includes a first member facing the occupant, a second member facing the first member, and a tether provided in the knee-bag for connecting the first member and the second member. The tether extends in a lateral direction and has end portions in a thickness direction of the knee-bag, and lateral ends in the lateral direction. At least one of the lateral ends has a portion located inwardly in the lateral direction so that air-flow spaces are formed between a left end of the tether and a left side of the knee-bag and between a right end of the tether and a right side of the knee-bag.