The connector consists of a male connector housing with a resilient locking arm, a terminal locking member mounted to the rear of the male connector housing in two steps, i.e., a preliminarily engaged state and a fully engaged state, and a stopper provided to the terminal locking member. In the fully engaged state, the stopper is located below a control portion of the resilient locking arm. When the male connector housing is unlocked from a female connector housing, the stopper comes into contact with the resilient locking arm to prevent an excessive displacement of the locking arm and keep the locking arm free from damage.