A medical apparatus according to the present invention includes: a flexible sheath an arm section having a bending part capable of bending operation and a first channel capable of inserting a procedure instrument therethrough, the arm section being disposed to protrude from a tip of the sheath and an operation stick having a second channel connected to the first channel and a bending operating part connected to the arm section by an operation-transmission member, wherein the operation stick has: a regulation section for regulating movement of the bending operating part and a falloff-preventive section for engaging with the procedure instrument inserted in the second channel to prevent the procedure instrument from falling from the operation stick.
