IN-SEAT AIRBAG DEVICE

An in-seat airbag device including an airbag main body having a front-rear chamber that expands past a side of a head of a passenger toward a seat front side and is disposed at the side of the head of the passenger, and a distal end chamber that expands from a seat front side end portion of the front-rear chamber toward a seat width direction inner side and is disposed at a seat front side of a face of the passenger, wherein the airbag main body and a seatback frame are connected by a force limiter mechanism that moves the airbag main body toward a seat front side when a load, which is toward a seat front side and is applied to the airbag main body, exceeds a predetermined threshold value at a time of head restraining when the head of the passenger is restrained.