An optical fiber adapter includes a main body, an elastic shutter member and a pair of inner housings. The main body has an accommodation room. The shutter member includes a fixed portion, a shutter plate, a connecting portion, an extending portion and a bent portion. The fixed portion is positioned in the accommodation room. The connecting portion connects the fixed portion with the shutter plate. The shutter plate is positioned within the accommodation room. The extending portion extends from the fixed portion and is connected with the bent portion. The bent portion is attached to a protrusion on a wall of the accommodation room. The inner housings are positioned within the accommodation room and each include a hollow cylinder extending from a flange. The flanges of the inner housings are attached to each other and one of the flanges is positioned above the bent portion of the shutter member.