A fiberboard splice apparatus is made up of a fiberboard splice part for adhering an old fiberboard fed from one roll fiberboard to an end portion of a new fiberboard fed from the other roll fiberboard to accomplish fiberboard splice therebetween, and a fiberboard feed device for forwarding the new fiberboard from the other roll fiberboard to the fiberboard splice part. The fiberboard feed device includes one fiberboard feed roll placed along an axial direction of the roll fiberboard to make the other roll fiberboard rotatable in a state brought into contact with a surface of the other roll fiberboard and a pair of pickup members located to interpose the fiberboard feed roll therebetween for picking up a tip portion of the other roll fiberboard while coming into sliding contact with the surface of the other roll fiberboard.