Patent ID: 6994285

Claim:
A tape cartridge, comprising: a resin circular reel portion stored in a case, the circular reel portion having a side end central part in an axial direction facing the outside of the case and being at least one of engageable to and disengageable from an external driving member; and a magnetic plate comprising a disk shaped member having magnetic properties, the magnetic plate being fitted to the side end central part of the circular reel portion so that a front surface of the magnetic plate in a thickness-wise direction is exposed, the magnetic plate attracting the external driving member by magnetic force to allow the external driving member and the circular reel portion to engage each other, a circumferential side surface of the magnetic plate having a coaxial stepped shape with a small diameter portion on the front surface side of the magnetic plate and a large diameter portion on a back surface side of the magnetic plate, and the magnetic plate having a circumferential projection which is formed in a region more on the back surface side than on the front surface of the circumferential side surface over a whole of an outer periphery of the magnetic plate, the outer diameter of the circumferential projection being larger than the outer diameter of the front surface side of the magnetic plate, so that the magnetic plate is fitted with the circular reel portion so as to be embedded in the circular reel portion at the circumferential projection of the magnetic plate.