An easily portable kit that opens to provide a good sized filleting board. The kit is comprised of a pair of substantially identical rectangular mating sections hinged together in end to end relation. When the sections are folded together they form a compact carrying case, and when unfolded they open out into an elongated work surface. Each section of the kit is formed with a recess that extends along one side of the work surface and this provides a convenient receptacle for the scraps that result from the filleting. One mating section is provided adjacent one end with an overlying bar, and this bar is adapted to positively engage a gill of the fish being filleted and securely hold the fish on the board.