A medical manipulator comprises a working unit (10) that performs operations, an operating unit (20) that generates instructions, a drive unit (50) that drives the working unit on the basis of instructions given thereto by the operating unit, a power transmission mechanism (60) for transmitting driving force of the drive unit to the working unit, and a control unit (40) for controlling the power transmission mechanism on the basis of instructions given thereto by the operating unit. The power transmission mechanism includes a first power transmission unit (61) interlocked with the drive unit, and a second power transmission unit (63) interlocked with the working unit and capable of being detachably connected to the first power transmission unit. A back drive torque of the first power transmission unit is larger than a back drive torque of the second power transmission unit.