An optical fiber adapter according to the present disclosure includes a main body and an elastic shutter member. The main body has an accommodation room defined by a first wall, a second wall, a third wall and a fourth wall, wherein the first wall faces the third wall and connects with the second and fourth walls. An indentation is formed outside the accommodation room and on the third wall. The shutter member includes a fixing portion positioned within the accommodation room and on the third wall, a shutter plate, a connecting portion connecting the fixing portion with the shutter plate, and a hooking portion extending from the connecting portion to hook on to the indentation on the third wall. The shutter plate extends from the connecting portion and into the accommodation room.