A medical apparatus for insertion into a body cavity which comprises an elastic linear body and delivers the distal tip to the predesignated object portion in a living organ, wherein the elastic linear body comprises a plurality of curved portions between the proximal end and the distal end, and at least one pair of adjacent curved portions are present on different planes which intersect each other. The apparatus can spontaneously control the direction thereof, and the distal tip can be delivered to the predesignated object portion in a living organ accurately and easily by pushing the apparatus into a body cavity.
