Wire tensioner

Provided is a wire tensioner with which the tensioning of aerial wires and the like can be performed safely and quickly. This wire tensioner (1) is equipped with: a tensioner main body section (2); a first attachment section (5); a pulling section (6) for connecting the tensioner main body section (2) and the first attachment section (5); a rotary drive mechanism (3), which is embedded in the tensioner main body section (2), and operates so as to take up the pulling section (6) into the interior of the tensioner main body section (2), thereby drawing the first attachment section (5) toward the tensioner main body section (2); a drive source (7) having an electric motor that supplies driving force to the rotary drive mechanism (3); a brake mechanism (4), which is embedded in the tensioner main body section (2) and engages the rotary drive mechanism (3); a second attachment section (8) provided on the tensioner main body section (2); a transmitter (9) for wirelessly controlling the electric motor of the drive source (7); a receiver (10) for receiving signals transmitted from the transmitter (9); and a battery (11) for supplying power to the drive source (7). The rotary drive mechanism (3) is rotationally driven primarily by the driving force of the electric motor of the drive source (7).