To provide a decorative wallboard for a graveyard boundary having new structure, in which brilliant appearance suitable for a graveyard can be realized by putting the color and feeling of natural stone to practical use.

Decorative-stone inserting grooves 3 being inclined at 45° and having oblique lattice patterns by crossing and combining linear groove sections 31 dug down in specified depth in the thickness direction are formed to the front and rear surfaces of wall substrates 2 installed on a graveyard borderline and composed of natural stone based on black. Decorative-stone section pieces 4 consisting of natural stone based on white and having sectional shapes bulged from the surfaces of the wall substrates 2 in addition to cross sections conformed to the decorative-stone inserting grooves 31 are combined and unified with the whole decorative-stone inserting grooves 31. Bulgy oblique lattice pattern sections based on white are formed to the wall substrates 2 based on black at that time.