Provided is a medical apparatus (1) including a treatment tool (2) having a distal-end treatment section (22), a joint section (23), and a flexible elongated body section (21) in this order from the distal end a driver (3) that is connected to the base end of the body section (21) and that supplies a driving force to the joint section (23) an operation input unit (4) that is a separate unit from the treatment tool (2) and the driver (3) and that has a main body (41) holdable with one hand of an operator and an operable member (42) disposed at a position where it is operable using a finger of the one hand holding the main body (41) and a controller (5) that controls the driver (3) in accordance with an operation command input to the operation input unit (4).
