A core holding structure includes a shaft portion in which a core for winding thereon a strip-shaped material is inserted and by which the core is rotationally driven. A roller is provided on an outer circumferential surface of the shaft portion. The roller is configured to make contact with an inner circumferential surface of the core inserted in the shaft portion and rotate in a direction in which the core is attached to or detached from the shaft portion. The core holding structure further includes an elastic member configured to hold the roller and bias the roller radially outwards from the shaft portion when pressed toward the surface of the shaft portion.