An electric connector includes a tubular conductive shell, covers provided outside the shell to cover at least part of the shell, and a movable cover coupled to the cover through a rotary shaft. The cover has locking pieces on a cable side. The movable cover has locking pieces to be engaged with the locking pieces. At least one of the locking piece or the locking piece includes multiple locking pieces arranged along a circumferential direction of a circle about the rotary shaft. The locking pieces and the locking pieces form a ratchet mechanism, and have such a structure that the locking pieces and the locking pieces are movable in an approaching direction and movement in a direction in which the locking pieces and the locking pieces are separated from each other is restricted.