A tube 30 provided in an endoscope apparatus 1 according to the present invention comprises a first area T1 provided inside a rigid region 6, 3 in the endoscope apparatus 1 and a second area T2 provided inside a flexible portion 7, 8 of the endoscope apparatus 1, and a rigidity of the first area T1 is set lower than a rigidity of the second area T2 to reduce a load by contact with an treatment instrument being inserted and thereby suppress damage and improve durability and also operability in assemble with a connection part.
