Abstract: Coupling device for safety belts for vehicles comprising a male part having catching surfaces thereon insertable in a female part having stop bolts engageable with said catching surface, a releasing member in said female part movable to a releasing position for disengaging said stop bolts from said surfaces, a spring loaded ejector member in said female part for ejecting said male part when said releasing member is moved to said releasing position, and a spring plate in said female part having an engaging portion to retain said releasing member in said releasing position, said ejector member cooperating with said spring plate such that when said male part is inserted into said female part said spring plate will be disengaged from said releasing member only when said catching surfaces of the male part have passed said stop bolts of the female part in the direction of insertion.