Abstract: A locking mechanism for connectors that permits easy unlocking of the mating connector housings comprising: a resilient locking arm and resilient auxiliary locking pieces, both provided at one of mating connector housings; locking projections provided at the locking arm, the locking projections including: a tapered engagement guide surface sloping upwardly from the front toward the rear and a lock-engagement surface at the rear end of the locking projections; engagement projections provided at the auxiliary locking pieces with longitudinally extending tapered guide surfaces; an engagement frame provided at the other connector housing to receive the advancing locking arm and auxiliary locking pieces, the engagement frame including lock-engagement projections to engage with the locking projections and engagement portions for engaging with the engagement projections; and an unlocking operation portion provided at the locking arm of the first connector housing, the unlocking operation portions projecting from the

Abstract: This invention relates to a construction in which an incomplete locking connection between a pair of connector housings is detected by a lock release member. According to the present invention, a cantilever-type flexible locking arm extending forward is provided on a male connector housing, and a lock engagement portion for the flexible locking arm is provided on a female connector housing. A lock release member having a lock release arm is mounted on the female connector housing so as to slide in a forward/rearward direction, and in an incompletely-fitted condition, the lock release member is engaged with the flexible locking arm to be prevented from moving to a predetermined position.