A connector device includes a first connector and a second connector. A first regulating member attached to the first insulating housing of the first connector and a second regulating member attached to the second insulating housing of the second connector include projecting portions, respectively. A first projecting portion of either one of the first and second regulating members provides a second projecting portion of the other regulating member with a first elastic force acting in a first direction in which the first and second insulating housings separate from each other. Additionally, the first projecting portion provides the second projecting portion with a second elastic force acting in a second direction in which the first and second insulating housings move toward each other. The regulating members also form latch members that act to separate the connectors towards a placed or initial state (e.g., FIGS. 10A, 10B) until a latching or retention position is reached in order to prevent the conductive terminals from engagement with the connectors in a half-fitted state (e.g., FIGS. 11A, 11B).