Provided is a connector for an animal, the connector having a stopper mechanism for enabling or disabling a slide bar to be pushed back. The connector for an animal SHL1 - SHL7 comprises a hook member a stem portion SL extending from an end of the hook member in a first direction Ds a slide bar Sb for being reciprocated in the first direction to open or close the hook member a lock member L1-L7 for being installed around the stem portion to rotate therearound with the first direction as a rotation axis and an operating member Kn for being connected to the slide bar so as to protrude in a second direction perpendicular to the first direction, the lock member including a cylindrical member CL1 - CL6 with a cylindrical space formed therein for housing the stem portion rotatably and projection Pr1, Pr4, Pr5, Pr6, Pr7 extending from a part of the hook member side end of the cylindrical member toward the hook member by a predetermined length, the projection facing to at least a part of the operating member or not when the lock member is rotated.
