Abstract: Upper and lower connector housings are respectively formed substantially in a box shape having upper and lower walls. The upper and lower connector housings are connected to each other by overlapping an upper wall of the lower connector housing and a lower wall of the upper connector housing in an opposing state. Engaging holes are respectively formed on the lower wall of the upper connector housing and the upper wall of the lower connector housing. The engaging hole of the upper connector housing is closed by the upper wall of the lower connector housing. The engaging hole of the lower connector housing is closed by the lower wall of the upper connector housing. Accordingly, the terminal can be securely prevented from coming out from the terminal receiving chamber and the adjacent terminals can be securely prevented from being shorted.