Connector and connector housing having a notch formed in an edge of the connector housing to facilitate connection

A connector is provided, by which an undesirable connection between housings of an improper product number can be prevented, and a connector housing is provided, by which an undesirable connection to a connector housing of an improper product number can be prevented. The connector having a lock security mechanism includes a female housing having a body part for receiving a male terminal and male housing having a body part receiving a female terminal and a bushing. The bushing is formed with a plurality of peripheral walls, one of which is provided with a notch. The body part of the male housing is inserted into the female housing and the female housing is inserted into the bushing, thereby the two housings are coupled with each other.