An image display apparatus comprising: a frame adapted to be positioned along a head of an observer; a display unit adapted to display an image that can be visually recognized by the observer; and a supporting part attached to the frame and supporting the display unit, wherein the frame can be fixed at a position in which the image displayed by the display unit connected to the frame via the supporting part is visually recognized by the observer, wherein the supporting part is adapted to be rotatable around a connecting portion to the frame, the supporting part has a pair of arms (51L, 51R) with first ends respectively connected to a portion at one end and a portion at the other end of the frame in horizontal directions for the observer and second ends connected to the display unit, the display unit has a light guiding member adapted to guide a light forming the image to the eye of the observer and to transmit outside light, the image display apparatus further comprises a movement mechanism adapted to allow the display unit to be movable in directions closer to or away from the frame, and characterized in that the movement mechanism comprises a pair of guide rails fixed in a casing of the display unit and a corresponding pair of sliding members provided in second portions of the pair of arms (51L, 51R), the guide rails being movably supported by the respective sliding members, the guide rails are cylindrical members and are placed so that an axial direction of the guide members is perpendicular to a traveling direction of image light from the light guiding member toward an eye of an observer, grooves are formed along a circumferential direction of outer circumferential surfaces of the guide rails in a plurality of positions along the axial direction of the guide rails, for determining stop positions of the guide rails, so that the guide rails are movable in a stepwise manner with respect to the sliding members and click feelings are caused when the guide rails are moved. a frame adapted to be positioned along a head of an observer; a display unit adapted to display an image that can be visually recognized by the observer; and a supporting part attached to the frame and supporting the display unit, wherein the frame can be fixed at a position in which the image displayed by the display unit connected to the frame via the supporting part is visually recognized by the observer, wherein the supporting part is adapted to be rotatable around a connecting portion to the frame, the supporting part has a pair of arms (51L, 51R) with first ends respectively connected to a portion at one end and a portion at the other end of the frame in horizontal directions for the observer and second ends connected to the display unit, the display unit has a light guiding member adapted to guide a light forming the image to the eye of the observer and to transmit outside light, the image display apparatus further comprises a movement mechanism adapted to allow the display unit to be movable in directions closer to or away from the frame, and characterized in that the movement mechanism comprises a pair of guide rails fixed in a casing of the display unit and a corresponding pair of sliding members provided in second portions of the pair of arms (51L, 51R), the guide rails being movably supported by the respective sliding members, the guide rails are cylindrical members and are placed so that an axial direction of the guide members is perpendicular to a traveling direction of image light from the light guiding member toward an eye of an observer, grooves are formed along a circumferential direction of outer circumferential surfaces of the guide rails in a plurality of positions along the axial direction of the guide rails, for determining stop positions of the guide rails, so that the guide rails are movable in a stepwise manner with respect to the sliding members and click feelings are caused when the guide rails are moved.