Connector having an operable member and a connector assembly

1. Field of the Invention A lever () of a connector assembly is in the form of a single plate, and a resilient lock () for locking the lever () at a connection completing position and a finger placing portion (B) used to rotate the lever () are adjacent to each other at one end of the lever (). The resilient lock () extends along the plane of the lever () and is resiliently deformable along a direction normal to the plane. Thus, a larger area can be secured for an unlocking portion (B) of the resilient lock () without increasing the thickness of the lever (), thereby providing good unlocking operational efficiency.