Tape reel and information recording medium

A tape reel comprising a first flange, a cylindrical body, and a second flange that are formed as separate objects,

• wherein the tape reel is constructed by joining the first flange, the cylindrical body, and the second flange in a state where an inner surface side of the first flange and an inner surface side of the second flange are in contact with the cylindrical body and face one another,
• the first flange includes joining pins erected on the inner surface of the first flange,
• the cylindrical body includes an outer circumferential wall, bosses which are fixed to the outer circumferential wall on an inside of the outer circumferential wall and in which through-holes through which the joining pins are inserted are formed, and an inner wall which is positioned inside the outer circumferential wall and disposed so as to follow the outer circumferential wall,
• the second flange has an opening formed in a central portion thereof and includes a protruding portion that is formed at an edge portion of the opening so as to protrude toward a center of the opening and includes through-holes through which the joining pins are inserted, and
• on at least one of the first flange and the second flange, a plurality of positioning pins that contact a surface on an outer circumferential wall side of the inner wall in a state where the cylindrical body is contacted by at least one of the first flange and the second flange to position the cylindrical body are formed.