The connector comprises a male (2) and a female (1) connector. An elastic lock arm (21), with half-fitting prevention locks (24) formed on its edges, is formed on the upper surface of the male connector housing. A connector lock (15) in the female connector housing (3) can slide in the direction of fitting. When the connectors are pushed together, against the force of a compression spring (17), the prevention locks pass lock stoppers (8). The lock arm prevents the male and female connectors from half-fitting to each other.
