Abstract: A two piece type electrical connector is provided which is matingly connect together boards in a designated correct polarity relation. A pair of first latch members L-shaped in cross-section are projected one at each end of a mother board-side housing and each have a ridge-like friction latch. A pair of second latch members L-shaped in cross-section are projected one at each end of a daughter board-side housing. One surface side of the second latch member has a projection inserted into the guide groove. One section of the projection has a recess-like friction latch frictionally engageable with the ridge-like friction latch.

Abstract: A pair of plug-side engagement members are mounted one at each end of a plug connector attached to a mother board. A pair of receptacle-side elastic members are provided on a daughter board attached to a receptacle connector, os that the receptacle-side elastic members correspond to the plug-side engagement members. With the plug-side engagement members connected to the receptacle-side members, the former is elastically engaged to the latter so that a mechanical insertion force is exerted on the plug-side and receptacle-side connectors to force the plug and receptacle together.