Abstract: Disclosed is an optical fiber cleaner. The optical fiber cleaner comprises an optical fiber cleaning space section (S) which has a central axis extending in a first direction, one end wall of the optical fiber cleaning space section in the first direction being provided with an optical fiber inserting hole (12) into which an optical fiber to be cleaned is inserted, and an optical cleaning space of the optical fiber cleaning space section being defined by a receiving wall (13) surrounding the optical fiber cleaning space; a cleaning agent introducing passage (20) adapted to eject a cleaning agent into the optical fiber cleaning space to clean the optical fiber inserted into the optical fiber cleaning space; and a cleaning agent collecting passage (30) provided at a lower part of the optical fiber cleaning space for discharging the cleaning agent out of the optical fiber cleaning space.