An image display device, comprising: a display unit (5, 100, 300) including a display panel (2, 102, 302) that displays an image on a front surface of the display panel (2, 102, 302), and a support member (3, 101, 301) opposing a back surface of the display panel (2, 102, 302) and supporting the display panel (2, 102, 302); the image display device further comprising a plurality of attaching members (9, 110, 310, 410b) bonded on or inserted into the support member (3, 101, 301); and a base plate (20, 120, 320) opposing a back surface of the support member (3, 101, 301), wherein the base plate (20, 120, 320) includes: a first opening part (21, 121, 321) including an opening (21a, 121a, 321a) through which a fastening member (71, 171, 371) passes, the fastening member (71, 171, 371) fastening the base plate (20, 120, 320) with a first attaching member (9a, 110a, 310a) that is one of the plurality of attaching members (9, 110, 310, 410b); and a second opening part (22, 122, 322) including an opening (22a, 122a, 322a) into which a protruding part (72, 172c, 372c, 410b) is inserted, the protruding part (72, 172c, 372c, 410b) being provided to a second attaching member (9b, 110b, 310b, 410b) that is another one of the plurality of attaching members (9, 110, 310, 410b) the opening (22a, 122a, 322a) of the second opening part (22, 122, 322) being larger than the protruding part (72, 172c, 372c, 410b) as viewed from a protruding direction of the protruding part (72, 172c, 372c, 410b), wherein a gap is formed between the protruding part (72, 172c, 372c, 410b) and the second opening part (22, 122, 322) to prevent the base plate (20, 120, 320) from having substantial mechanical engagement with the protruding part (72, 172c, 372c, 410b). a display unit (5, 100, 300) including a display panel (2, 102, 302) that displays an image on a front surface of the display panel (2, 102, 302), and a support member (3, 101, 301) opposing a back surface of the display panel (2, 102, 302) and supporting the display panel (2, 102, 302); the image display device further comprising a display panel (2, 102, 302) that displays an image on a front surface of the display panel (2, 102, 302), and a support member (3, 101, 301) opposing a back surface of the display panel (2, 102, 302) and supporting the display panel (2, 102, 302); the image display device further comprising a plurality of attaching members (9, 110, 310, 410b) bonded on or inserted into the support member (3, 101, 301); and a base plate (20, 120, 320) opposing a back surface of the support member (3, 101, 301), wherein the base plate (20, 120, 320) includes: a first opening part (21, 121, 321) including an opening (21a, 121a, 321a) through which a fastening member (71, 171, 371) passes, the fastening member (71, 171, 371) fastening the base plate (20, 120, 320) with a first attaching member (9a, 110a, 310a) that is one of the plurality of attaching members (9, 110, 310, 410b); and a second opening part (22, 122, 322) including an opening (22a, 122a, 322a) into which a protruding part (72, 172c, 372c, 410b) is inserted, the protruding part (72, 172c, 372c, 410b) being provided to a second attaching member (9b, 110b, 310b, 410b) that is another one of the plurality of attaching members (9, 110, 310, 410b) the opening (22a, 122a, 322a) of the second opening part (22, 122, 322) being larger than the protruding part (72, 172c, 372c, 410b) as viewed from a protruding direction of the protruding part (72, 172c, 372c, 410b), wherein a gap is formed between the protruding part (72, 172c, 372c, 410b) and the second opening part (22, 122, 322) to prevent the base plate (20, 120, 320) from having substantial mechanical engagement with the protruding part (72, 172c, 372c, 410b). a first opening part (21, 121, 321) including an opening (21a, 121a, 321a) through which a fastening member (71, 171, 371) passes, the fastening member (71, 171, 371) fastening the base plate (20, 120, 320) with a first attaching member (9a, 110a, 310a) that is one of the plurality of attaching members (9, 110, 310, 410b); and a second opening part (22, 122, 322) including an opening (22a, 122a, 322a) into which a protruding part (72, 172c, 372c, 410b) is inserted, the protruding part (72, 172c, 372c, 410b) being provided to a second attaching member (9b, 110b, 310b, 410b) that is another one of the plurality of attaching members (9, 110, 310, 410b) the opening (22a, 122a, 322a) of the second opening part (22, 122, 322) being larger than the protruding part (72, 172c, 372c, 410b) as viewed from a protruding direction of the protruding part (72, 172c, 372c, 410b), wherein a gap is formed between the protruding part (72, 172c, 372c, 410b) and the second opening part (22, 122, 322) to prevent the base plate (20, 120, 320) from having substantial mechanical engagement with the protruding part (72, 172c, 372c, 410b).