Disclosed is a hinge connecting mechanism for connecting a connector housing to a lid in a hinged fashion via a hinge portion integrally molded with the connector housing with a small thickness. The hinge connecting mechanism assures that a malfunction does not arise where the hinge portion is undesirably broken or torn away from the container as the lid is repeatedly opened and closed. A plate member connected to a connector housing in a hinged fashion includes a hinge extension having the same width as that of a hinge portion, while extending in continuation from the hinge portion. The hinge extension is formed on a surface of the plate member adapted to face an upper wall of the connector housing when the plate member is closed.