To provide an expandable apparatus for medical treatment which is used to detach adhered portions of nervous tissue or the like from each other or to form space through which liquid treatment material is injected onto the body tissue, an air tube is prevented from moving, and a marker is prevented from being removed therefrom.

The expandable apparatus for medical treatment includes: an expandable member expanded by air pressure; the air tube guiding air into the expandable member, the air tube having one end coupled to the expandable member to support the expandable member; a connector being coupled to the air tube in one end; a body including an air inlet pipe into which the air is supplied from an outside, the body having one end coupled to the connector; a front cap protecting a coupling junction between the air tube and the connector, coupled to the body such that the body supports the connector while the connector is brought into close contact with the body; and a long needle extending from the other end of the body to the expandable member through the body, the connector and the air tube, with a marker integrally provided on one end of the long needle corresponding to a position of the expandable member, the marker enabling a user to determine a location of the expandable member.