An optical fiber adapter includes a main body, two hook members, a hollow middle member and an elastic shutter member. The hook member has two hooks and two opposing walls that define a passage. The main body has an access opening on a first wall thereof for the two hook members and middle member to place within the passage of the main body. The middle member is positioned between the two hook members when the hook members and middle member are placed in the passage of the main body. The shutter member includes a fixing portion, a shutter plate and a connecting portion. The fixing portion is positioned in the accommodation recess formed on the first wall of the first hook member. The connecting portion connects the fixing portion with the shutter plate. The shutter plate extends from the connecting portion and into the passage.