A power tool comprising: a motor (20, 130) accommodated in a housing, the motor (20, 130) rotating with electric power supplied from a power source; a controller for controlling rotation of the motor; a switch (12, 151) configured to be manually switched between on and off of power supply from the power source to the motor (20, 130); first braking means for braking the motor (20, 130) when the switch (12, 151) is switched from on to off; and second braking means for braking the motor (20, 130) on the basis of a predetermined signal from the controller when the switch (12, 151) is in an on state, a control circuit including the controller, wherein the first braking means comprises a first closed circuit formed when the switch (12, 151) is switched from on to off, and the first closed circuit is configured to brake the motor (20, 130), the second braking means comprises a second closed circuit generated by the controller, and the first closed circuit and the second closed circuit are provided at the control circuit, wherein the second closed circuit comprises a switching element (45, 152, 153) to be switched on by means of the predetermined signal, characterised in that the first closed circuit comprises a brake coil (23, R20, R21), wherein the second braking means uses the brake coil (23, R20, R21) of the first braking means to brake the motor (20,130), the first closed circuit comprises the switch (12, 151) in the off-state and the brake coil (23, R20, R21); and the second closed circuit comprises the switch (12, 151) in the on-state, the brake coil (23, R20, R21), and the switching element (45, 152, 153). a motor (20, 130) accommodated in a housing, the motor (20, 130) rotating with electric power supplied from a power source; a controller for controlling rotation of the motor; a switch (12, 151) configured to be manually switched between on and off of power supply from the power source to the motor (20, 130); first braking means for braking the motor (20, 130) when the switch (12, 151) is switched from on to off; and second braking means for braking the motor (20, 130) on the basis of a predetermined signal from the controller when the switch (12, 151) is in an on state, a control circuit including the controller, wherein the first braking means comprises a first closed circuit formed when the switch (12, 151) is switched from on to off, and the first closed circuit is configured to brake the motor (20, 130), the second braking means comprises a second closed circuit generated by the controller, and the first closed circuit and the second closed circuit are provided at the control circuit, wherein the second closed circuit comprises a switching element (45, 152, 153) to be switched on by means of the predetermined signal, characterised in that the first closed circuit comprises a brake coil (23, R20, R21), wherein the second braking means uses the brake coil (23, R20, R21) of the first braking means to brake the motor (20,130), the first closed circuit comprises the switch (12, 151) in the off-state and the brake coil (23, R20, R21); and the second closed circuit comprises the switch (12, 151) in the on-state, the brake coil (23, R20, R21), and the switching element (45, 152, 153).