To provide a cracking classifier which is capable of efficiently cracking an agglomerated material such as molding sand and of efficiently separating a metal flake included in molding sand.

The cracking classifier includes a cracking means 7 which is arranged on the screen 5 of a vibration sieve 3 and cracks an object to be cracked moving on the screen 5 wherein the cracking means 7 is provided with an object storing part 9 to temporarily store the object moving on the screen 5 and a block material 11 for cracking which is arranged in the object storing part 9 and cracks the object in the object storing part 9. The object storing part 9, which is installed below the screen 5, includes an arrangement part 13 for block material 11 for cracking where the block arrangement part 13 for cracking is arranged and an inclination surface 15 extending slantly upward in the advance direction of the object from the block material arrangement part 13.