Easily-manufacturable connector capable of prevention of accidental opening of mouth of hook caused by movement of opening-closing rod in opening direction. Connector main body has paired retaining holes on both sides of hook base part. Misoperation-preventive member has its opposite ends formed into paired inwardly-bent engagement portions engageable in paired retaining holes, and has its midway part configured to be movable from front end of hook toward opening-operation body and vice versa in in-contact/out-of-contact relation. Paired engagement portions (paired retaining holes) are axially staggered so that midway part of misoperation-preventive member is urged from front end of hook toward opening-operation body. Connector main body has stopper for bringing midway part of misoperation-preventive member to stop in a position close to opening-operation body against urgence on misoperation-preventive member.