An endoscope apparatus comprising: an insertion portion which is a flexible tube body in which a distal end portion, a bending portion, and a flexible tube portion are linked in this order from a distal end, an operation portion connected with a proximal end of the insertion portion, the operation portion including in the following order from the distal end, a bend preventing portion connected so as to cover a proximal end portion of the flexible tube portion, a grasping portion including a treatment instrument insertion portion and a main operation portion, and an endoscope tube provided from the distal end portion of the insertion portion to the operation portion through the bending portion, and connected with a branch component provided in the operation portion, the branch component being fixed to a fixing plate which is provided in the grasping portion of the operation portion and having a first opening provided at a position inclined toward a proximal end side with a predetermined angle (θ) with respect to a longitudinal axis and a second opening formed at a distal end and communicating with the first opening, and a third opening provided on a proximal end with respect to the longitudinal axis, characterized in that the endoscope tube comprises: a first area provided in the operation portion and having a multiple layer structure with an element wire layer between resin layers (31, 32) provided from a connection position with the second opening to the bend preventing portion of the operation portion; and a second area provided from a distal end face of the bend preventing portion of the operation portion to the bending portion through the insertion portion and having a multiple layer structure with a high-density blade layer being a high-density net layer provided to be continuous to the element wire layer of the first area between the resin layers (31, 32), wherein an end portion of the first area is connected with the second opening of the branch component, and the element wire layer is provided between the resin layers (31, 32), as a low-density blade layer being a low-density net layer to reduce a rigidity of the first area to be lower than a rigidity of the second area so as to easily deform a connection part with a treatment instrument inserted from the first opening. an insertion portion which is a flexible tube body in which a distal end portion, a bending portion, and a flexible tube portion are linked in this order from a distal end, an operation portion connected with a proximal end of the insertion portion, the operation portion including in the following order from the distal end, a bend preventing portion connected so as to cover a proximal end portion of the flexible tube portion, a grasping portion including a treatment instrument insertion portion and a main operation portion, and an endoscope tube provided from the distal end portion of the insertion portion to the operation portion through the bending portion, and connected with a branch component provided in the operation portion, the branch component being fixed to a fixing plate which is provided in the grasping portion of the operation portion and having a first opening provided at a position inclined toward a proximal end side with a predetermined angle (θ) with respect to a longitudinal axis and a second opening formed at a distal end and communicating with the first opening, and a third opening provided on a proximal end with respect to the longitudinal axis, characterized in that the endoscope tube comprises: a first area provided in the operation portion and having a multiple layer structure with an element wire layer between resin layers (31, 32) provided from a connection position with the second opening to the bend preventing portion of the operation portion; and a second area provided from a distal end face of the bend preventing portion of the operation portion to the bending portion through the insertion portion and having a multiple layer structure with a high-density blade layer being a high-density net layer provided to be continuous to the element wire layer of the first area between the resin layers (31, 32), wherein an end portion of the first area is connected with the second opening of the branch component, and the element wire layer is provided between the resin layers (31, 32), as a low-density blade layer being a low-density net layer to reduce a rigidity of the first area to be lower than a rigidity of the second area so as to easily deform a connection part with a treatment instrument inserted from the first opening. a first area provided in the operation portion and having a multiple layer structure with an element wire layer between resin layers (31, 32) provided from a connection position with the second opening to the bend preventing portion of the operation portion; and a second area provided from a distal end face of the bend preventing portion of the operation portion to the bending portion through the insertion portion and having a multiple layer structure with a high-density blade layer being a high-density net layer provided to be continuous to the element wire layer of the first area between the resin layers (31, 32), wherein an end portion of the first area is connected with the second opening of the branch component, and the element wire layer is provided between the resin layers (31, 32), as a low-density blade layer being a low-density net layer to reduce a rigidity of the first area to be lower than a rigidity of the second area so as to easily deform a connection part with a treatment instrument inserted from the first opening.