The invention allows, in a connector having a moving plate provided at the anterior of a connector housing, a retainer to be attached to this connector housing from the anterior. A retainer attachment hole 17, for allowing a retainer 40 to be attached, is formed at an anterior end face of a connector housing 10. A window hole 36 is formed in a moving plate 30, at least a portion of the retainer 40 protruding towards the anterior from this window hole 36. Consequently, the retainer 40 can be pushed in, and other operations can be performed thereto, from the anterior of the moving plate 30. That is, the retainer 40 can be attached from the anterior to the connector housing 10.