A safety harness for preventing the fall of a user, including: a strap assembly intended to be passed around the body of the user and adapted to ensure the support thereof, and a means for the hooking to a fall-prevention system, the hooking means being connected by a link to said strap assembly, the link including: a first fastening means of low strength, able to yield in case of fall, the low strength being lower than the force that said means undergoes during a fall of the user equipped with the harness, and a second fastening means of high strength, which does not yield in case of fall, the high strength being higher than the force that said means undergoes during a fall of the user equipped with the harness, the strap assembly including at least two suspender straps passing on the right shoulder and the left shoulder, respectively, of the user, and each going down substantially vertically laterally on the right and left front, respectively, of the user, in front suspender-strap portions, the hooking means being arranged on a holding strap, before the fall said holding strap being arranged substantially horizontally and extended between the two front suspender-strap portions and said holding strap being fastened on each side to said two front suspender-strap portions by the first fastening means and the second fastening means, said second fastening means being placed at a higher height than the first fastening means, so that, in case of fall causing a traction effort making the first fastening means yield, the holding strap is detached from the two front suspender-strap portions up to the second fastening means, which resists, so that the hooking means that was umbilical before the fall shifts to a higher height upward the user, characterized in that the first and second fastening means are seams between straps. a strap assembly intended to be passed around the body of the user and adapted to ensure the support thereof, and a means for the hooking to a fall-prevention system, the hooking means being connected by a link to said strap assembly, the link including: a first fastening means of low strength, able to yield in case of fall, the low strength being lower than the force that said means undergoes during a fall of the user equipped with the harness, and a second fastening means of high strength, which does not yield in case of fall, the high strength being higher than the force that said means undergoes during a fall of the user equipped with the harness, the strap assembly including at least two suspender straps passing on the right shoulder and the left shoulder, respectively, of the user, and each going down substantially vertically laterally on the right and left front, respectively, of the user, in front suspender-strap portions, the hooking means being arranged on a holding strap, before the fall said holding strap being arranged substantially horizontally and extended between the two front suspender-strap portions and said holding strap being fastened on each side to said two front suspender-strap portions by the first fastening means and the second fastening means, said second fastening means being placed at a higher height than the first fastening means, so that, in case of fall causing a traction effort making the first fastening means yield, the holding strap is detached from the two front suspender-strap portions up to the second fastening means, which resists, so that the hooking means that was umbilical before the fall shifts to a higher height upward the user, characterized in that the first and second fastening means are seams between straps. a first fastening means of low strength, able to yield in case of fall, the low strength being lower than the force that said means undergoes during a fall of the user equipped with the harness, and a second fastening means of high strength, which does not yield in case of fall, the high strength being higher than the force that said means undergoes during a fall of the user equipped with the harness, the strap assembly including at least two suspender straps passing on the right shoulder and the left shoulder, respectively, of the user, and each going down substantially vertically laterally on the right and left front, respectively, of the user, in front suspender-strap portions, the hooking means being arranged on a holding strap, before the fall said holding strap being arranged substantially horizontally and extended between the two front suspender-strap portions and said holding strap being fastened on each side to said two front suspender-strap portions by the first fastening means and the second fastening means, said second fastening means being placed at a higher height than the first fastening means, so that, in case of fall causing a traction effort making the first fastening means yield, the holding strap is detached from the two front suspender-strap portions up to the second fastening means, which resists, so that the hooking means that was umbilical before the fall shifts to a higher height upward the user, characterized in that the first and second fastening means are seams between straps.