VENTILATION DEVICE

PROBLEM TO BE SOLVED: To obtain a ventilation device which is small in the number of components for constituting an air feed wind passage, and secured in air tightness and heat insulation performance.SOLUTION: The ventilation device includes: an air feed branching box body 18 which is formed of an insulation material so as to possess an air feed duct connecting port attachment face 19 attached with a plurality of in-room air feed duct connecting ports 10 and an opening face 61 having openings communicating with the plurality of in-room air feed duct connecting ports 10, and accommodated in a body; and an air feed air blower unit 17 including an air feed air blower 15 for forming an air flow which flows into the air feed branching box body 18 from the openings of the opening face 61 and flows out from the plurality of in-room air feed duct connecting ports 10 and a casing 16 for the air feed air blower having an air blower accommodation space for accommodating the air feed air blower 15 therein, wherein the air blower accommodation space is in communication with the plurality of in-room air feed duct connecting ports 10 by inserting the air feed air blower unit into the air feed branching box body 18 from the openings of the opening face 61. A structure for holding air tightness by the engagement of a protrusive shape and a recessive shape is arranged in a point in which the air feed branching box body 18 abuts on the casing 16 for the air feed blower.