Provided is an occupant leg restraint device suitable for restraining legs of an occupant when an automobile has an oblique collision. An occupant leg restraint device 1 has an airbag 4 that inflates in front of legs of an occupant in a front seat of an automobile, and an inflator 5 for supplying gas to the lower part of the airbag 4 to inflate the airbag 4. The airbag 4 has a first pane 11 on the occupant side and a second panel 12 on the side opposite thereto. A plurality of pockets 60 recessed from the first panel 11 in the direction away from the occupant are provided in the upper part of the airbag 4. Knees N of the occupant enter the pockets 60, and fit into and engage with the pockets 60, and the lateral movement of the knees N is thereby restrained.