Floor panel, which, at least at two opposite sides (2-3), comprises coupling parts (4-5) with which two of such floor panels (1) can be coupled to each other; wherein these coupling parts (4-5) form a horizontally active locking system (6) and a vertically active locking system (7); wherein the horizontally active locking system (6) comprises a male part (8) in the form of a downwardly directed projection (10) and a female part (9) with a seat (12) open towards the top, which have horizontally active locking surfaces (14, 15); and wherein the vertically active locking system (7) comprises a vertically active locking element (16), which forms part of an insertion piece (17) provided in the female part; characterized in that said insertion piece is formed at least of the combination of a bottom part (23); a back part (22) adjoining thereto and an elastically movable lock-up body (26) directed downward with a free extremity, which lock-up body, by means of a hinge portion (32), is connected directly or indirectly to the back part (22).