Provided is a sleeve for an optical connector in which a ferrule that holds an optical fiber is inserted, wherein the connector to which the sleeve is mounted can be made smaller in the connector engagement-direction. A sleeve for optical connector (1) is formed having a tubular section (10) into which a ferrule is inserted and is characterized in that a catching section (14) protruding in the radial direction of the tubular section (10) is formed at one end section. A slit (101) may be formed in the tubular section (10).