PROBLEM TO BE SOLVED: To provide a molding drum whose width can be adjusted in response to the length of a food material to be rotated and processed. SOLUTION: The flanges 3, 4 of a molding drum 1 for rotating and molding a food raw material are laterally movably attached to the threaded portion of a substrate 2. The width of a molding portion is adjusted in response to the width of a food material 24 and subsequently fixed. A synthetic fiber layer 7 and an elastomer layer 6 are disposed in the contact portion of the molding drum with the food material 24.