A driver comprising: a strike section which moves in a first direction to strike a fastener, wherein the strike section includes a piston and a driver blade that are connected to each other; and a bumper which comes into contact with the strike section and restricts the range in which the strike section moves in the first direction, the driver further comprising: a support section which supports the bumper; a connection section which is connected to the support section and is disposed in a direction intersecting the first direction; a drive section which is supported by the connection section and moves the strike section in a second direction, wherein the drive section includes a motor that is rotatable around a first center line; a conversion mechanism configured to convert rotational force of the motor into moving force of the strike section in the second direction; a first receiving section which receives a load acting on the support section in the first direction when the strike section moves in the first direction to hit the bumper; and a second receiving section which receives a load acting on the support section in a circumferential direction about the first centerline of the drive section when the strike section moves in the first direction to hit the bumper, characterised in that the first receiving section has a first extension section extending in the first direction in the support section, and a second extension section extending in the second direction in the support section. a strike section which moves in a first direction to strike a fastener, wherein the strike section includes a piston and a driver blade that are connected to each other; and a bumper which comes into contact with the strike section and restricts the range in which the strike section moves in the first direction, the driver further comprising: a support section which supports the bumper; a connection section which is connected to the support section and is disposed in a direction intersecting the first direction; a drive section which is supported by the connection section and moves the strike section in a second direction, wherein the drive section includes a motor that is rotatable around a first center line; a conversion mechanism configured to convert rotational force of the motor into moving force of the strike section in the second direction; a first receiving section which receives a load acting on the support section in the first direction when the strike section moves in the first direction to hit the bumper; and a second receiving section which receives a load acting on the support section in a circumferential direction about the first centerline of the drive section when the strike section moves in the first direction to hit the bumper, characterised in that the first receiving section has a first extension section extending in the first direction in the support section, and a second extension section extending in the second direction in the support section. a support section which supports the bumper; a connection section which is connected to the support section and is disposed in a direction intersecting the first direction; a drive section which is supported by the connection section and moves the strike section in a second direction, wherein the drive section includes a motor that is rotatable around a first center line; a conversion mechanism configured to convert rotational force of the motor into moving force of the strike section in the second direction; a first receiving section which receives a load acting on the support section in the first direction when the strike section moves in the first direction to hit the bumper; and a second receiving section which receives a load acting on the support section in a circumferential direction about the first centerline of the drive section when the strike section moves in the first direction to hit the bumper, characterised in that the first receiving section has a first extension section extending in the first direction in the support section, and a second extension section extending in the second direction in the support section.