A manipulator comprising: an elongated main portion, a distal end portion disposed at a distal end of the main portion, and a bendable portion provided between the main portion and the distal end portion; a plurality of wires that are connected to the distal end portion and that extend to the main portion via the bendable portion; a plurality of pulling mechanisms that are provided in the main portion to pull the wires, each pulling mechanism including a motor that is configured to generate rotational force and a plurality of power transmitters (8, 10, 11) configured to transmit, to proximal ends of the wires, the rotational force generated by the motor as linear motion in a longitudinal direction of the main portion, wherein each of the power transmitters (8, 10, 11) includes a flexible shaft member that is disposed in a longitudinal direction in the main portion and that is configured to be rotated about an axis extending in the longitudinal direction by the rotational force generated by the motor, a threaded shaft member that connects the proximal end of the corresponding wire to the flexible shaft member and that is configured to be rotated together with the flexible shaft member, and a nut member that is engaged with the threaded shaft member and that is configured to feed the rotating threaded shaft member in the longitudinal direction; a fault detector configured to detect a fault in a pulling mechanism; and a wire relaxing unit configured to relax, when the fault is detected by the fault detector, the plurality of wires in which tension is generated between the distal end portion and the power transmitters by pushing and pulling of the wires in the longitudinal direction by the linear motion transmitted from the power transmitters (8, 10, 11); wherein the fault detector includes a curvature sensor that is configured to detect a bending angle of the bendable portion and to transmit the detected bending angle of the bendable portion to a fault determination circuit, the fault determination circuit being configured to compare the detected bending angle of the bendable portion with a bending angle defined by a command signal transmitted from a control device to each motor of the plurality of pulling mechanisms; and when it is detected that a difference between the detected bending angle of the bendable portion and the bending angle defined by the command signal is larger than a predetermined threshold value, the fault determination circuit is further configured to determine that the pulling mechanism to which the motor belongs is faulty, and to transmit the determination result to the control device that activates a recovery mode in which the wire relaxing unit is actuated to relax the plurality of wires. an elongated main portion, a distal end portion disposed at a distal end of the main portion, and a bendable portion provided between the main portion and the distal end portion; a plurality of wires that are connected to the distal end portion and that extend to the main portion via the bendable portion; a plurality of pulling mechanisms that are provided in the main portion to pull the wires, each pulling mechanism including a motor that is configured to generate rotational force and a plurality of power transmitters (8, 10, 11) configured to transmit, to proximal ends of the wires, the rotational force generated by the motor as linear motion in a longitudinal direction of the main portion, wherein each of the power transmitters (8, 10, 11) includes a flexible shaft member that is disposed in a longitudinal direction in the main portion and that is configured to be rotated about an axis extending in the longitudinal direction by the rotational force generated by the motor, a threaded shaft member that connects the proximal end of the corresponding wire to the flexible shaft member and that is configured to be rotated together with the flexible shaft member, and a nut member that is engaged with the threaded shaft member and that is configured to feed the rotating threaded shaft member in the longitudinal direction; a fault detector configured to detect a fault in a pulling mechanism; and a wire relaxing unit configured to relax, when the fault is detected by the fault detector, the plurality of wires in which tension is generated between the distal end portion and the power transmitters by pushing and pulling of the wires in the longitudinal direction by the linear motion transmitted from the power transmitters (8, 10, 11); wherein the fault detector includes a curvature sensor that is configured to detect a bending angle of the bendable portion and to transmit the detected bending angle of the bendable portion to a fault determination circuit, the fault determination circuit being configured to compare the detected bending angle of the bendable portion with a bending angle defined by a command signal transmitted from a control device to each motor of the plurality of pulling mechanisms; and when it is detected that a difference between the detected bending angle of the bendable portion and the bending angle defined by the command signal is larger than a predetermined threshold value, the fault determination circuit is further configured to determine that the pulling mechanism to which the motor belongs is faulty, and to transmit the determination result to the control device that activates a recovery mode in which the wire relaxing unit is actuated to relax the plurality of wires.