Stapler device with anti-jamming magazine of the staples (S) and provided with a strike site (F) of the staples fed by the magazine (1) comprising at least:a container element (3) for storing and sliding the staples (S) towards the strike site (F);a closure member (5) of the container (3) to open and close the latter;a thrusting member (7), having two mutually parallel sidewalls and a connection wall approximately perpendicular to the sidewalls and of which it connects two sides so that at least one cross section of this thrusting member is U-shaped; said thrusting member (7) is assigned to transmit to the staples (S) contained in the container element (3) of the magazine (1) an elastic force directed towards the strike site. Said device comprises a support member (9) assigned to support the thrusting member (7) and to slide along at least one first guide member (13) of the stapler device, and it comprises resilient means (17) acting, in the direction of the strike site, on the thrusting member (7) directly or by means of the support member (9), which is provided with at least a concave housing (19) for matching with outer faces of free edges (21), opposite to the respective connecting sides of the transverse connection wall, of the side walls of the thrusting member (7) preventing deformation of the latter (7).