There is provided a holding member in which a chemical container part is easily loaded into and unloaded from a storage portion, which can suppress sudden detachment of the part from the storage portion, and in which a sterilization treatment of a part can be effectively performed. The present invention is a holding member provided with a sheet-like substrate portion having a first surface and a second surface, and a plurality of storage portions each penetrating the first surface and the second surface of the substrate portion and each protruding in a direction of a side of the first surface and in a form of a cylinder where a chemical container part is to be stored. The storage portions each comprise a first opening end portion forming a loading and unloading mouth for the part at a protruded tip of each of the storage portions, a bulging portion where an inner wall face of each of the storage portions on a side of the first opening end portion bulges continuously from the first opening end portion in a direction of an inside of the cylinder, thereby forming an opening widened toward the first opening end portion, a second opening end portion formed at a base end of each of the storage portions by the second surface of the substrate portion, and a tapered-off portion where the inner wall face of each of the storage portions on a side of the second opening end portion is formed in such a way as to narrow toward the second opening end portion.
