A tape cartridge improving an assembling property of a leader member, for leading out a tape-shaped recording medium, to which a leading edge of the tape is fixed. The tape cartridge accommodates a reel hub unit rotatably, for winding a magnetic recording medium on its periphery, and includes a leader member for holding and fixing a leading edge of the magnetic recording medium. The leader member has a pin member having a pair of collar portions between which the magnetic recording medium is positioned, and a clamp member fitted in between the collar portions from through an opening so formed in a longitudinal direction of a cylindrical body as to extend to end surfaces on both sides of the cylindrical body, and clamping the magnetic recording medium between the pin member and the clamp member itself. Chamfered portions are provided at edge portions of the opening of the clamp member.