A wiper blade assembly including a contact member, an elastic member which supports the contact member, a cover member which covers the elastic member, a coupling cover which covers the elastic member and has a housing portion, and an adapter which can be inserted into or removed from the housing portion of the coupling cover. The coupling cover has a first coupling portion located on a side of the housing portion, and the adapter has a second coupling portion located on a side thereof. The second coupling portion includes a pressure structure and a coupling structure separated from the pressure structure by a predetermined distance. The first coupling portion is coupled to the coupling structure. A structure for coupling the adapter to the coupling cover and a structure for separating the adapter from the coupling cover are provided separately. The adapter can be easily separated from the coupling cover.