DRIVER'S SEAT AIRBAG DEVICE

[Problem]To provide a driver side airbag device capable of first expanding and deploying a predetermined portion of an airbag cushion with a simple configuration.[Resolution Means]A driver side airbag device 100 is provided with an airbag module 105 containing a steering wheel 106, an inflator 112, and a cushion 104. The steering wheel 106 contains: a housing portion 109 that stores the airbag module 105; and a cover member 110 that seals the housing portion 109. The cover member 110 has: a design region 150 on an occupant side; and a thin-walled portion 160 formed from an upper portion region E2 to a lower portion region E1 of the design region 150 and that is cleaved open by an expansion pressure of the cushion 104 to open cover doors 162a, 162b. The thin-walled portion 160 contains a first plate thickness portion 160a and a second plate thickness portion D1 that is thinner than the first plate thickness portion 160a. The second plate thickness portion D1 is formed in the lower portion region E1 of the design region 150.