An endoscopic device includes a proximal side contact portion at which an outer peripheral portion of an insertion section is in air-tight contact with a fixed member over an entire circumference in circumferential directions, and a cavity is defined to a distal direction side of the proximal side contact portion between the insertion section and the fixed member in radial directions. In a protruding state of a hood, a first path, making an inside of the hood communicate with the cavity, is defined, and the fixed member and the hood are in air-tight contact with each other over the entire circumference in the circumferential directions at a distal side contact portion to the distal direction side of the cavity. In a housed state of the hood, a second path, making the cavity communicate with an outside of the fixed member, is defined.
