A connector including: a housing; a cover that is fixed to the housing so as to cover an opening of the housing; a slider that is housed within the housing, is provided so as to be slidable along the housing, and is configured to slide so that the housing is fitted to the partner connector; an operation-target part configured to slide the slider upon being operated; and a lock mechanism that includes a slider engagement part that is formed on the slider, and a second cover engagement part that is formed on the cover, and is configured such that the slide engagement part engages with the second cover engagement part in a situation where fitting of the housing and the partner connector to each other is complete, so that the cover is prevented from being separated from the slider.