Abstract: Provided is a form panel for construction, which is foldable so as to be used in a planar section and a corner of a concrete building. The form panel includes a front plate supporting cast concrete, a folded portion formed at the center of a rearward surface of the front plate in a lengthwise direction to be thinner than portions positioned at its opposite sides, side connecting sections and upper and lower connecting sections, which are formed at edges of the front plate excluding the folded portion, and one or more reinforcing members installed at the side connecting sections and the rearward surface of the front plate. The form panel is formed of a synthetic resin material by an injection-molding technique. Since the form panel is foldable at a predetermined angle, it can be easily used as a form panel for a wall forming a predetermined angle. In particular, it is possible to prevent inconvenience and difficulty in fabricating form panels for use in corners for construction.