A connector comprises a connector housing with a plurality of terminal accommodating chambers and a rear holder which to be inserted into and coupled with a rear end of the connector housing for restricting pulling-up of terminals inserted respectively into the terminal accommodating chambers. A stopper body which is coupled on a rear section of the rear holder through a hinge section and which is interchangeable between a laid-down condition extending along an inserting direction of the rear holder and a standing-up condition which intersects with the laid-down condition is engaged with the rear end of the connector housing in a tentative locking state when the stopper body is biased into the standing-up condition. The stopper body is brought to the laid-down condition in a complete locking state so as to be accommodated within the rear end of the connector housing. A plurality of indication marks are displayed on a rear face of the stopper body when the stopper body is in the standing-up condition to indicate accommodation of the terminals into the respective terminal accommodating chambers.