Abstract: A tape reel for a tape cassette capable of substantially preventing deformation thereof, even when it is thin-walled to substantially reduce a cycle time required for a molding step of the tape reel. The tape reel includes a reel hub and a disc-like flange. Reinforcing ribs include an annular rib arranged on an outer periphery of a disc-like flange and a plurality of linear ribs arranged on an outer surface of the disc-like flange so as to extend from a core stabilizing surface rib to the annular rib. The linear ribs are so arranged that each of the linear ribs intersects at least one of the other linear ribs at a position which is further than a midpoint between the core stabilizing surface rib and the annular rib.

Abstract: A tape cassette consisting of two cassette halves containing a pair of tape reels around which a length of tape is wound. Columnar pivots are formed upright on an inner wall of one of the cassette halves to turnably support reel detents which keep the tape reels from turning when the tape cassette is not in use. Each of the pivots is formed with an axially extending groove for cooling the pivot at a rate substantially equal to a cooling rate of the cassette halves. Each of the grooves has a width substantially uniform throughout an axial length of the pivot.