1. An image display apparatus comprising:
a transparent hoard that transmits visible light;
a screen that is provided on a first surface of said transparent board;
a projector that projects images toward said screen from the side of a second surface of said transparent board; and
a support unit that supports said transparent board from the side of said second surface;
wherein said projector is arranged outside a space that is enclosed by said transparent board and said support unit;
wherein a plurality of units that each include at least said projector and transparent board are arranged in a row or in matrix
form; and

wherein: from among said plurality of units, two units that are adjacent in a direction of projection of said projector are
configured such that an end surface of said transparent board of one unit that is orthogonal to the direction of projection
of said projector is joined to an end surface of said transparent board of the other unit that is orthogonal to the direction
of projection of said projector to form a joined edge surface; said joined edge surface being formed such that a joining portion
on said second surface is positioned more on said projector side than a joining portion on said first surface.