Connection element for forming a permanent electric connection between a first and a second electric lead (1, 2), each being attached in fixed position to a respective first and second housing (3, 4), such that the housings have guiding means (5) which, when the housings (3, 4) are brought together, co-operate in such manner that the leads are correctly positioned for forming the electric connection and the connection forming device can act upon the electric leads (1, 2) to be connected through openings (7) in the housings.