PURPOSE: To make the connection of a connector easy and eliminate the complexity of operation by engagedly fixing the projecting member installed at one case wherein a connector is housed into the engagement groove made in the other case and sliding the connector box in the direction of engagement to insert and pull out the connector.

CONSTITUTION: A body case 1 is abutted against the other case 4, and then, projecting portions 6-1, 6-2 are engagedly fixed in engagement groove 3-1, 3-2, and under such a condition, a lever 8a is moved up and down to make a connector box 7 slide in the direction of Arrow C so that male connectors 5-1-5-3 and female connectors 2-1-2-3 can be inserted and pulled out. It is thereby possible to insert and pull out various types of connectors at a single finger touch for operation so that the connectors can be easily connected and the cable to make them come out to the outside becomes unnecessary and resultantly, the complexity of operation can be eliminated.