A tape cassette comprising a cassette composed of an upper and a lower cassette half, and a partition plate disposed in the cassette to extend therein in a transverse direction to define an upper and a lower compartment. The partition plate has first and second reel insertion holes. The cassette has disposed therein first and second reels extending into the upper and lower compartments through the first and second reel insertion holes of the partition plates, respectively. The lower compartment has housed therein a first magnetic tape retained at one end to the lower half part of the first reel and at the other end to the lower half part of the second reel and guided to travel between the first and second reels. The upper compartment has disposed therein a third reel loosely engaged with the upper half part of the first reel and has housed therein a second magnetic tape endlessly wound on the third reel.
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