An image display device, comprising: a display panel configured to display a plurality of frames; a barrier panel positioned to overlap the display panel and configured to form a one or more light-transmitting portion and a one or more dimming portion by which a traveling direction of at least part of image light emitted from the display panel is directed to a right eye of a user and a traveling direction at least part of the image light is directed to a left eye of the user; and a controller configured to control the display panel and the barrier panel, wherein the display panel is configured to form a one or more first display region, and the display panel is configured to display a right-eye image visually recognized by the user's right eye in a one or more right-eye visible region of the one or more first display region and is configured to display a left-eye image visually recognized by the user's left eye in a one or more left-eye visible region of the one or more first display region, the barrier panel is configured to to form a one or more first barrier region corresponding to the one or more first display region, and the barrier panel is configured to form the one or more light-transmitting portion and the one or more dimming portion in the one or more first barrier region so that the one or more right-eye visible region and the one or more left-eye visible region are located at different positions of the one or more first display region, and the controller is configured to cause the display panel to display a portion located in the one or more first display region as one parallax image frame comprising a first sub-frame and a second sub-frame when displaying two consecutive frames on the display panel, the controller is configured to control display of the parallax image in the one or more first display region and formation of the one or more light-transmitting portion and the one or more dimming portion in the one or more first barrier region for each parallax image frame so that the user visually recognizes images displayed in the first sub-frame and the second sub-frame included in the one parallax image frame as one parallax image, and the controller is configured to form the one or more dimming portion in entirety of the one or more first barrier region during a frame change period comprising a timing of changing a display from the parallax image frame to a new parallax image frame, and characterized in that the controller is configured not to form the one or more dimming portion in the entirety of the one or more first barrier region and maintain its state during a sub-frame change period comprising a timing of changing display from the first sub-frame to the second sub-frame in the one or more first display region. a display panel configured to display a plurality of frames; a barrier panel positioned to overlap the display panel and configured to form a one or more light-transmitting portion and a one or more dimming portion by which a traveling direction of at least part of image light emitted from the display panel is directed to a right eye of a user and a traveling direction at least part of the image light is directed to a left eye of the user; and a controller configured to control the display panel and the barrier panel, wherein the display panel is configured to form a one or more first display region, and the display panel is configured to display a right-eye image visually recognized by the user's right eye in a one or more right-eye visible region of the one or more first display region and is configured to display a left-eye image visually recognized by the user's left eye in a one or more left-eye visible region of the one or more first display region, the barrier panel is configured to to form a one or more first barrier region corresponding to the one or more first display region, and the barrier panel is configured to form the one or more light-transmitting portion and the one or more dimming portion in the one or more first barrier region so that the one or more right-eye visible region and the one or more left-eye visible region are located at different positions of the one or more first display region, and the controller is configured to cause the display panel to display a portion located in the one or more first display region as one parallax image frame comprising a first sub-frame and a second sub-frame when displaying two consecutive frames on the display panel, the controller is configured to control display of the parallax image in the one or more first display region and formation of the one or more light-transmitting portion and the one or more dimming portion in the one or more first barrier region for each parallax image frame so that the user visually recognizes images displayed in the first sub-frame and the second sub-frame included in the one parallax image frame as one parallax image, and the controller is configured to form the one or more dimming portion in entirety of the one or more first barrier region during a frame change period comprising a timing of changing a display from the parallax image frame to a new parallax image frame, and characterized in that the controller is configured not to form the one or more dimming portion in the entirety of the one or more first barrier region and maintain its state during a sub-frame change period comprising a timing of changing display from the first sub-frame to the second sub-frame in the one or more first display region.