A tape cassette 30 includes a rear indentation 68C that is provided on a rear edge side of a bottom wall 30B, between the periphery of a cassette case and a tape housing area. A rear indicator portion 900 that indicates color information relating to a tape is provided in a specified area R0 included in the rear indentation 68C. A tape color is indicated by whether or not an aperture is formed in a lateral information section Y1, among a plurality of lateral information sections Y included in the rear indicator portion 900. A character color is indicated by whether or not an aperture is formed in a lateral information section Y2.
