To prevent clogging to be caused by a raw material from occurring while a crushing raw material is made not to be restricted by a size.

A crushing raw material feed plate 2 is slantly connected to a rotary source 1 arranged above a corn crusher B, and arranged above the rotary source 1. A liner 3 is preferably attached to a surface of the feed plate 2 for protection of the feed plate. It is preferable for preventing the liner 3 from being abraded that a plurality of recessed grooves are arranged parallel on a surface of the liner 3 and made to penetrate the crushing raw material feed plate 2 in its slant direction.