An electric stapler comprising: a driver mechanism including a driver member, wherein a staple is driven into sheets by the driver member in a driving direction; and a clincher mechanism provided to face the driver mechanism, wherein legs of the staple driven and penetrating through the sheets are bent along a back side of the sheets by the clincher mechanism, wherein the driver mechanism further includes: a main body; a clamp part slidably accommodated in the main body, wherein the clamp part is movable toward or away from the clincher mechanism so as to clamp the sheets in cooperation with the clincher mechanism; and a biasing mechanism that urges the clamp part toward the sheets, wherein the driver mechanism further includes: a gear mechanism driven by a drive source; a link member swung by a cam included in the gear mechanism, wherein the driver member is driven by the link member, characterized in that the link member includes a biasing engagement part engageable with the biasing mechanism, wherein the biasing engagement part engages with the biasing mechanism to allow the biasing mechanism to urge the clamp part when the link member is swung to a predetermined position in the driving direction, wherein the link member includes a clamp engagement part engageable with the clamp part, and wherein the clamp engagement part engages with the clamp part to push the clamp part toward the home position when the link member is swung to a predetermined position in a direction opposite to the driving direction, wherein when the link member is located at the uppermost position, the clamp part is in the home position, where the clamp part is the most remote from the clincher mechanism, and the biasing engagement part is located at a position higher than an upper end of the biasing mechanism, wherein the biasing engagement part is not engaged with the biasing mechanism, and wherein the biasing mechanism is out of operation of urging the clamp part wherein, when the link member is moved downward in the driving direction, the clamp engagement part lifting the clamp is moved downward, the engagement of the clamp engagement part and the clamp part is released and thus the clamp part is slidable downward by the movement amount of the clamp engagement part.. a driver mechanism including a driver member, wherein a staple is driven into sheets by the driver member in a driving direction; and a clincher mechanism provided to face the driver mechanism, wherein legs of the staple driven and penetrating through the sheets are bent along a back side of the sheets by the clincher mechanism, wherein the driver mechanism further includes: a main body; a clamp part slidably accommodated in the main body, wherein the clamp part is movable toward or away from the clincher mechanism so as to clamp the sheets in cooperation with the clincher mechanism; and a biasing mechanism that urges the clamp part toward the sheets, wherein the driver mechanism further includes: a gear mechanism driven by a drive source; a link member swung by a cam included in the gear mechanism, a main body; a clamp part slidably accommodated in the main body, wherein the clamp part is movable toward or away from the clincher mechanism so as to clamp the sheets in cooperation with the clincher mechanism; and a biasing mechanism that urges the clamp part toward the sheets, wherein the driver mechanism further includes: a gear mechanism driven by a drive source; a link member swung by a cam included in the gear mechanism, a gear mechanism driven by a drive source; a link member swung by a cam included in the gear mechanism, wherein the driver member is driven by the link member, characterized in that the link member includes a biasing engagement part engageable with the biasing mechanism, wherein the biasing engagement part engages with the biasing mechanism to allow the biasing mechanism to urge the clamp part when the link member is swung to a predetermined position in the driving direction, wherein the link member includes a clamp engagement part engageable with the clamp part, and wherein the clamp engagement part engages with the clamp part to push the clamp part toward the home position when the link member is swung to a predetermined position in a direction opposite to the driving direction, wherein when the link member is located at the uppermost position, the clamp part is in the home position, where the clamp part is the most remote from the clincher mechanism, and the biasing engagement part is located at a position higher than an upper end of the biasing mechanism, wherein the biasing engagement part is not engaged with the biasing mechanism, and wherein the biasing mechanism is out of operation of urging the clamp part wherein, when the link member is moved downward in the driving direction, the clamp engagement part lifting the clamp is moved downward, the engagement of the clamp engagement part and the clamp part is released and thus the clamp part is slidable downward by the movement amount of the clamp engagement part..