In an electrical connector, a female housing is made to mate with a male housing. The female housing has guide ways each formed perpendicularly to a direction of mating of the male housing with the female housing. In the guide ways, a latch metal is disposed. The guide ways of the female housing respectively have opening portions from each of which the corresponding latch part of the latch metal is capable of projecting toward the male housing. When the male housing is inserted into the female housing, the latch parts are respectively projected from the opening portions of the female housing toward the male housing. The latch parts are respectively locked at predetermined inclined planes a formed on the male housing.