Device for repair of a mitral valve cord of a heart by transfemoral approach, and intended to be positioned in a sealed inserter arranged in a femoral vein (transfemoral percutaneous access) in order to go into a left atrium of the heart by going through a septal wall thereof (transseptal), the device comprises: - a first assembly engageable with a handle under control of control means for actuation of an assembly for placement and attachment of an artificial cord on a papillary muscle of a ruptured elongated cord, said assembly is arranged at an end of a manipulation rod and comprises an elastic staple connected pivotably and removably at the end of the rod so as to pass, under the action of the control means, from a position folded back along the rod to a position swung angularly relative to the rod for coming into place perpendicularly in front of the papillary muscle where the cord must be replaced, the first assembly comprises means for opening the staple in order to, under the action of the control means, staple the papillary muscle of the ruptured cord, the first assembly comprises means for unlocking with which, under the action of the control means, to release the staple, said staple being connected to an artificial cord which goes back in the rod; - a second assembly engageable with a handle under the control of control means for actuation of the assembly for placement and attachment of the artificial cord to a leaflet of the valve, the second assembly is arranged at an end of a manipulation rod and comprises attachment means (9, 16) intended to slide along the artificial cord and pivotably connected to the end of the rod so as to pass, under action of the control means, from a position folded back along the rod to a position swung angularly relative to the rod for placing parallel to the mitral leaflet, where the means of attachment (9, 16) are able, under the action of the command means, to attach the artificial cord to said leaflet. - a first assembly engageable with a handle under control of control means for actuation of an assembly for placement and attachment of an artificial cord on a papillary muscle of a ruptured elongated cord, said assembly is arranged at an end of a manipulation rod and comprises an elastic staple connected pivotably and removably at the end of the rod so as to pass, under the action of the control means, from a position folded back along the rod to a position swung angularly relative to the rod for coming into place perpendicularly in front of the papillary muscle where the cord must be replaced, the first assembly comprises means for opening the staple in order to, under the action of the control means, staple the papillary muscle of the ruptured cord, the first assembly comprises means for unlocking with which, under the action of the control means, to release the staple, said staple being connected to an artificial cord which goes back in the rod; - a second assembly engageable with a handle under the control of control means for actuation of the assembly for placement and attachment of the artificial cord to a leaflet of the valve, the second assembly is arranged at an end of a manipulation rod and comprises attachment means (9, 16) intended to slide along the artificial cord and pivotably connected to the end of the rod so as to pass, under action of the control means, from a position folded back along the rod to a position swung angularly relative to the rod for placing parallel to the mitral leaflet, where the means of attachment (9, 16) are able, under the action of the command means, to attach the artificial cord to said leaflet.