An electric blind rivet fastening device for deforming a sleeve of a rivet body so as to expand diametrically by drawing, in the axial direction, a mandrel of a blind rivet including a mandrel and a rivet body, thereby fastening the rivet body to a mounted member via the expanded sleeve portion and a flange of the rivet body, and breaking the mandrel, the blind rivet fastening device comprising: an electric motor provided on one end; a power transmitting means for transmitting rotation of the electric motor; a spindle provided in front of the electric motor and rotated by the power transmitted by the power transmitting means; a collection chamber for collecting the broken portions of mandrels shafts, which chamber is provided between the electric motor and the spindle a ball screw nut adjacent to the spindle, and connected to and rotated by the spindle; a ball screw shaft provided in a central portion of the ball screw nut in the axial direction, and moved in the axial direction by the rotation of the ball screw nut; a drawing means (30, 32) connected to the ball screw shaft for gripping and drawing a shaft portion of the mandrel, wherein the drawing means comprise a pulling head, said pulling head moves between a home position HP at the front end and a rear position RP where the mandrel is broken; a trigger provided in a handle portion; the electric blind rivet fastening device being characterized in that the electric motor is a brushless motor; and in that it further comprises a Hall element for detecting the rotation count of the electric motor, wherein the position of the pulling head in the axial direction is determined by the rotation of the electric motor detected by the Hall element; a control means for controlling the forward rotation, reverse rotation, and stopping of the electric motor based on operation of the trigger and the Hall element rotation count of the electric motor, and; a first clutch (61, 62) consisting of a spindle clutch 61 and a nut clutch 62 is provided in the portion between the spindle 14 and the ball screw nut 44, and a second clutch (63, 64) is provided in front of the ball screw shaft 36, which consists of a rear clutch 63 and a front clutch 64, wherein the first and second clutches are provided to keep excessive torque from moving the pulling head 30 beyond the range defined by the home position HP and the rear position RP. an electric motor provided on one end; a power transmitting means for transmitting rotation of the electric motor; a spindle provided in front of the electric motor and rotated by the power transmitted by the power transmitting means; a collection chamber for collecting the broken portions of mandrels shafts, which chamber is provided between the electric motor and the spindle a ball screw nut adjacent to the spindle, and connected to and rotated by the spindle; a ball screw shaft provided in a central portion of the ball screw nut in the axial direction, and moved in the axial direction by the rotation of the ball screw nut; a drawing means (30, 32) connected to the ball screw shaft for gripping and drawing a shaft portion of the mandrel, wherein the drawing means comprise a pulling head, said pulling head moves between a home position HP at the front end and a rear position RP where the mandrel is broken; a trigger provided in a handle portion; the electric blind rivet fastening device being characterized in that the electric motor is a brushless motor; and in that it further comprises a Hall element for detecting the rotation count of the electric motor, wherein the position of the pulling head in the axial direction is determined by the rotation of the electric motor detected by the Hall element; a control means for controlling the forward rotation, reverse rotation, and stopping of the electric motor based on operation of the trigger and the Hall element rotation count of the electric motor, and; a first clutch (61, 62) consisting of a spindle clutch 61 and a nut clutch 62 is provided in the portion between the spindle 14 and the ball screw nut 44, and a second clutch (63, 64) is provided in front of the ball screw shaft 36, which consists of a rear clutch 63 and a front clutch 64, wherein the first and second clutches are provided to keep excessive torque from moving the pulling head 30 beyond the range defined by the home position HP and the rear position RP.