The present invention relates to a device for lashing down a rotorcraft wing, said wing being provided with at least first and second adjacent blades P and P', the ends of said blades being provides with respective endpieces. In addition, the device comprises a main cord CP having a first end CPE1 fastened to first fastener means 5' arranged on a second end CPE2 secured to a second blade P' and having a second end CPE2 secured to a second fastener means M1 arranged on a first endpiece of the first blade P. The lashing-down endpiece includes first fastener means 5 for fastening to a first main cord CP and second fastener means M1 for fastening to a second main cord CP.