<p>To realize an optical connector plug whose optical connector element can be engaged and disengaged by simple insertion and removal operation and which comprises (a) a plug housing (202) formed with a shoulder portion (253) between a large hollow portion (254) and a small hollow portion (251); (b) a plug ferrule (201) connected to an optical fiber (204) and formed with a flange portion (201B) slidably fitted into the large hollow portion of said plug housing and an end portion (201A) passed through the small hollow portion of said plug housing; and (c) a spring (203) housed within said plug housing to urge the flange portion of said plug ferrule against the shoulder portion (253) of said plug housing (202).</p>
