A successive screw fastener 1 comprising: a grip unit 2 which has a screw fastening bit arranged to protrude and rotationally drive the bit by a switch operation and a clutch; a screw fastener main body unit 3 which is arranged below the grip unit 2, supports the grip unit 2 to be upwardly and downwardly movable, arranges a tip of the bit to face a fastening acting position, and fastens a screw at a fastening target position on a lower side; and a magazine unit 4 which is detachably disposed to the screw fastener main body unit 3, accommodates a screw rope 6 holding many screws at predetermined intervals, and pays out the screw rope 6 toward the screw fastener main body unit 3, the successive screw faster 1 being configured to sequentially guide the respective screws held by the screw rope 6 to the fastening acting position below a tip of the bit in tandem with a rising operation of the grip unit 2, and successively fasten the respective screws to the fastening target position below the screw fastener main body unit 3 by using rotational force of the bit in tandem with a lowering operation of the grip unit 2 in a rotating state of the bit, wherein the grip unit 2 is configured to include a trigger switch 16 having a direction lever 17 which sets forward rotation and reverse rotation directions of a rotary drive unit 22 which rotationally drives the bit, the screw fastener main body unit 3 comprises: a gap adjustment mechanism section 91 which changes a gap between a feeder block 62 which guides the screw held by the screw rope 6 to the fastening acting position and a guide cover 63 arranged to face the feeder block 62 on the basis of translation adjustment of the guide cover 63 wherein the guide cover 63 precisely slides in a front-and-back direction in stages without being displaced to a recessed portion 92 in correspondence with a rotating position of an adjustment dial 75; a screw feed mechanism section 61 which enables feeding the screws to the fastening acting position one by one while avoiding interference between a head portion of each screw and the tip of the bit, and enables taking out the screw held by the screw rope 6 from the fastening acting position by an operation of an operator; a screw guide position adjustment mechanism section 101 which is arranged at a lower end portion of the screw fastener main body unit 3 and adjusts a position of a screw guide 77 arranged to abut on the fastening target position; and a magazine mounting mechanism section 111 having rigidity which is provided on a rear portion side of the screw fastener main body unit 3, and the magazine unit 4 comprises a magazine main body 121 which accommodates and pays out the screw rope 6 and a lid body 131 which covers the magazine main body 121, and the magazine main body 121 is attachable to and detachable from the screw fastener main body unit 3 by using elastic force of a spring plate 114 which is arranged in the magazine main body 121 and has spring properties. a grip unit 2 which has a screw fastening bit arranged to protrude and rotationally drive the bit by a switch operation and a clutch; a screw fastener main body unit 3 which is arranged below the grip unit 2, supports the grip unit 2 to be upwardly and downwardly movable, arranges a tip of the bit to face a fastening acting position, and fastens a screw at a fastening target position on a lower side; and a magazine unit 4 which is detachably disposed to the screw fastener main body unit 3, accommodates a screw rope 6 holding many screws at predetermined intervals, and pays out the screw rope 6 toward the screw fastener main body unit 3, a gap adjustment mechanism section 91 which changes a gap between a feeder block 62 which guides the screw held by the screw rope 6 to the fastening acting position and a guide cover 63 arranged to face the feeder block 62 on the basis of translation adjustment of the guide cover 63 wherein the guide cover 63 precisely slides in a front-and-back direction in stages without being displaced to a recessed portion 92 in correspondence with a rotating position of an adjustment dial 75; a screw feed mechanism section 61 which enables feeding the screws to the fastening acting position one by one while avoiding interference between a head portion of each screw and the tip of the bit, and enables taking out the screw held by the screw rope 6 from the fastening acting position by an operation of an operator; a screw guide position adjustment mechanism section 101 which is arranged at a lower end portion of the screw fastener main body unit 3 and adjusts a position of a screw guide 77 arranged to abut on the fastening target position; and a magazine mounting mechanism section 111 having rigidity which is provided on a rear portion side of the screw fastener main body unit 3, and the magazine unit 4 comprises a magazine main body 121 which accommodates and pays out the screw rope 6 and a lid body 131 which covers the magazine main body 121, and the magazine main body 121 is attachable to and detachable from the screw fastener main body unit 3 by using elastic force of a spring plate 114 which is arranged in the magazine main body 121 and has spring properties.