An airbag assembly in a vehicle is provided. The airbag assembly comprises a base and a housing to be inserted into the base. The housing includes a first connection part protruding from an outer wall of the housing and a second connection part extending from the first connection part and facing the outer wall and the base includes a first slot extending in a first direction and a second slot extending from the first slot at a second direction different from the first direction, and the first slot includes an open end to receive the first connection part. The housing is connected with the base when first connection part is received in the second slot.