The invention relates to a guide bar for a loop-forming tool, and a method for producing the same. Specifically, the guide bar (1) for the loop-forming tool comprises a body (2) provided in a longitudinal direction (3) and an accommodation part (4) of the loop-forming tool. The accommodation part (4) of the loop-forming tool comprises bridging connection parts (5) and grooves (6) alternative in the longitudinal direction (3). To provide guide bar capable of providing a stable temperature, the bridging connection parts (5) are formed by thin plates (7, 7a, 7b) each provided with a broad side (8) and a narrow side (9) for limiting the grooves, wherein the thin plates are connected with the body (2) in a region of the narrow side (9).