A medical instrument includes a first joint. The first joint has a first axis, a second axis, a third axis, a first connection member which has a first rotation-transmitting portion, a second connection member which has a second rotation-transmitting portion, a third connection member, and a third rotation-transmitting portion. The first rotation-transmitting portion and the second rotation-transmitting portion are connected to each other so as to pivot by interlocking with each other. The third connection member has a fourth rotation-transmitting portion which is provided in an end portion of the third connection member and which is connected to the third rotation-transmitting portion so as to pivot about the first axis or the second axis by interlocking with the third rotation-transmitting portion.
