A power tool, which is adapted to perform a prescribed operation on a workpiece by driving a tool accessory, comprising a motor, a tool accessory driving shaft that is arranged in parallel to a rotation axis of the motor and is driven by the motor to drive the tool accessory, a body housing that houses at least part of the tool accessory driving shaft and the motor, a tool accessory holding member that can move between a clamp position to clamp the tool accessory between the tool accessory holding member and the tool accessory driving shaft in order to hold the tool accessory and a release position to release the clamping of the tool accessory in order to remove the tool accessory, a holding mechanism for holding the tool accessory holding member in the clamp position, and a transmitting member that is connected to the tool accessory driving shaft and transmits rotation of the motor to the tool accessory driving shaft, wherein the holding mechanism includes an engagement member that can engage with the tool accessory holding member in the clamp position, and a biasing member that biases the engagement member so as to provide the engagement member with a force of holding the tool accessory holding member in the clamp position, the engagement member is disposed within the body housing, the tool accessory is held on one end region of the tool accessory driving shaft, and the transmitting member is connected to the tool accessory driving shaft between the ends of the tool accessory driving shaft, characterized in that the engagement member is disposed on the other end region of the tool accessory driving shaft in an axial direction of the tool accessory driving shaft. a motor, a tool accessory driving shaft that is arranged in parallel to a rotation axis of the motor and is driven by the motor to drive the tool accessory, a body housing that houses at least part of the tool accessory driving shaft and the motor, a tool accessory holding member that can move between a clamp position to clamp the tool accessory between the tool accessory holding member and the tool accessory driving shaft in order to hold the tool accessory and a release position to release the clamping of the tool accessory in order to remove the tool accessory, a holding mechanism for holding the tool accessory holding member in the clamp position, and a transmitting member that is connected to the tool accessory driving shaft and transmits rotation of the motor to the tool accessory driving shaft, wherein the holding mechanism includes an engagement member that can engage with the tool accessory holding member in the clamp position, and a biasing member that biases the engagement member so as to provide the engagement member with a force of holding the tool accessory holding member in the clamp position, the engagement member is disposed within the body housing, the tool accessory is held on one end region of the tool accessory driving shaft, and the transmitting member is connected to the tool accessory driving shaft between the ends of the tool accessory driving shaft, characterized in that the engagement member is disposed on the other end region of the tool accessory driving shaft in an axial direction of the tool accessory driving shaft.