The present invention provides a balloon unit for an endoscope apparatus comprising: a balloon for an endoscope apparatus having an opening formed in a cylindrical shape in which an insert part of an endoscope or an insert supporter having the insert part inserted therein is inserted and fixed and a cylinder body having an inner diameter larger than an outer diameter of the insert part or the insert supporter wherein the opening of the balloon is fitted over and fixed to the cylinder body to form a unit and the unit is attached to the insert part or the insert supporter or detached from the insert part or the insert supporter.
