Single-cord type blind comprising: - a stationary body having a fixing shaft and rotary plate having a rotary cylinder with engaging parts formed on an inner surface and a distal end thereof, respectively, the fixing shaft being provided on an outer surface thereof with a washer groove and being fixedly mounted in the rotary cylinder; - a stopper which is inserted around the fixing shaft of the stationary body and is fastened to the engaging parts of the stationary body and which has a through-opening, a front coupling part and a rear fixing part; - a protective tube which is fixedly engaged with the coupling grooves provided in the rotary cylinder of the stationary body and which has a hollow cylindrical body having a front opening and rear-side multiple coupling pins, wherein the cylindrical body is provided, on a front end thereof, with an inner fixing ring against which a spring is seated; - a rotary tube which is coupled around the protective tube; and - a washer which is fastened to the washer groove of the fixing shaft; characterized in that: - the rotary cylinder comprises coupling grooves formed on an inner surface and a distal end thereof; - a rotary section is mounted into the through-opening of the stopper and has front coupling grooves and a pair of symmetrically-arranged fastening protrusions each having an upper flange; - the spring is mounted around the coupling part of the stopper; - the protective tube is fixedly engaged with the coupling grooves provided in the rotary cylinder of the stationary body; - the rotary tube is provided with a plurality of inner protrusions to be coupled into the coupling grooves of the rotary section. - a stationary body having a fixing shaft and rotary plate having a rotary cylinder with engaging parts formed on an inner surface and a distal end thereof, respectively, the fixing shaft being provided on an outer surface thereof with a washer groove and being fixedly mounted in the rotary cylinder; - a stopper which is inserted around the fixing shaft of the stationary body and is fastened to the engaging parts of the stationary body and which has a through-opening, a front coupling part and a rear fixing part; - a protective tube which is fixedly engaged with the coupling grooves provided in the rotary cylinder of the stationary body and which has a hollow cylindrical body having a front opening and rear-side multiple coupling pins, wherein the cylindrical body is provided, on a front end thereof, with an inner fixing ring against which a spring is seated; - a rotary tube which is coupled around the protective tube; and - a washer which is fastened to the washer groove of the fixing shaft; - the rotary cylinder comprises coupling grooves formed on an inner surface and a distal end thereof; - a rotary section is mounted into the through-opening of the stopper and has front coupling grooves and a pair of symmetrically-arranged fastening protrusions each having an upper flange; - the spring is mounted around the coupling part of the stopper; - the protective tube is fixedly engaged with the coupling grooves provided in the rotary cylinder of the stationary body; - the rotary tube is provided with a plurality of inner protrusions to be coupled into the coupling grooves of the rotary section.