The invention concerns a device for maintaining on the ground the threshold bar, the bar which is used to assemble at a door two facings on the floor and which tends to be lifted at said ends. The device comprises a female part (1) provided with toothed notches (2) and a male part (3) provided with toothed notches (4) having a shape matching that of the toothed notches of the female part so as to fix the device on the door jamb (5). The male part and the female part are provided with an antiskid portion (6). The plate (7) of the male part is such that fixing the device on the door jamb prevents the threshold bar (8) from being lifted. The inventive device is designed to maintain on the ground threshold bars present in most dwellings.