A shutter includes a base that has a ventilation hole, and a louver that is attached to the base and opens and closes the ventilation hole, wherein the louver includes a turning portion pivotally and turnably supported on the base, and a blade coupled to the turning portion at one end, the blade turns about a turning axis of the turning portion to open the ventilation hole by receiving air passing through the ventilation hole, and the blade has a shape in which an air receiving surface which receives the air is curved toward a direction in which the blade turns to open the ventilation hole, with respect to a plane which couples the turning axis and a turning end of the blade.