An airbag device for a driver's seat may include: a housing mounted on a steering part; an inflator mounted on the housing; and a cushion accommodated in the housing, deployed by gas supplied from the inflator, and having a cushion front part and a cushion rear part, wherein the cushion front part is configured such that an upper portion thereof is expanded and deployed and deployment of a lower portion thereof is partially restricted when the cushion is deployed, and the cushion rear part is disposed opposite the cushion front part to partially restrict the deployment of the lower portion of the cushion front part.