A tape cassette, comprising: a housing including a top wall (31 A) having a top surface and a support hole, a bottom wall having a bottom surface and a support hole, and a side wall, a rear wall (31 C), the top wall and the bottom wall having a rectangular shape whose longitudinal direction is a left-and-right direction of the housing, the top wall, the bottom wall, and the side wall defining a periphery of the housing; a first tape housing area communicating with the support holes (65A, 65B); at least one tape (55, 57, 58, 59) wound and mounted in the first tape housing area defined within the periphery; an ink ribbon housing area defined within the periphery and positioned to the front right portion of the housing, a second tape housing area lined up at the right side of the first tape housing area and positioned to the rear of the ink ribbon housing area in a plan view, and a color indicator portion disposed between the rear wall and the first and second tape housing area (33A, 33B) and in a specified area adjacent to the tape housing areas on a rear edge side of the bottom wall, the color indicator portion indicating color information relating to the at least one tape and including a plurality of lateral information sections (Y1 and Y2), the plurality of lateral information sections being a plurality of strip-shaped sections extending along the left-and-right direction of the housing and aligned in a front-rear direction of the housing, and the color indicator portion includes a plurality of vertical information sections (X1 to X4) that are a plurality of strip-shaped sections extending along the front-rear direction of the housing and aligned in the left-and-right direction of the housing; the plurality of vertical information sections (X1 to X4) include a reference vertical information section and a subordinate vertical information section (X1, X2, X4) arranged in parallel with the reference vertical information section, the first and second tape housing areas each having a generally circular shape in a plan view, the first and second tape housing areas being aligned with each other in the left-and-right direction such that outer peripheral edges of the first and second tape housing areas contact with each other, the reference vertical information section including a reference line that is an imaginary line extending along the front-rear direction and passing through a contact point of the outer peripheral edges of the first and second tape housing areas; and at least one aperture provided in the plurality of lateral information sections (Y1 and Y2) is provided in at least one of the reference vertical information section and the subordinate vertical information sections (X1, X2, X4) and builds a pattern, wherein: the pattern indicates the color information relating to the at least one tape. a housing including a top wall (31 A) having a top surface and a support hole, a bottom wall having a bottom surface and a support hole, and a side wall, a rear wall (31 C), the top wall and the bottom wall having a rectangular shape whose longitudinal direction is a left-and-right direction of the housing, the top wall, the bottom wall, and the side wall defining a periphery of the housing; a first tape housing area communicating with the support holes (65A, 65B); at least one tape (55, 57, 58, 59) wound and mounted in the first tape housing area defined within the periphery; an ink ribbon housing area defined within the periphery and positioned to the front right portion of the housing, a second tape housing area lined up at the right side of the first tape housing area and positioned to the rear of the ink ribbon housing area in a plan view, and a color indicator portion disposed between the rear wall and the first and second tape housing area (33A, 33B) and in a specified area adjacent to the tape housing areas on a rear edge side of the bottom wall, the color indicator portion indicating color information relating to the at least one tape and including a plurality of lateral information sections (Y1 and Y2), the plurality of lateral information sections being a plurality of strip-shaped sections extending along the left-and-right direction of the housing and aligned in a front-rear direction of the housing, and the color indicator portion includes a plurality of vertical information sections (X1 to X4) that are a plurality of strip-shaped sections extending along the front-rear direction of the housing and aligned in the left-and-right direction of the housing; the plurality of vertical information sections (X1 to X4) include a reference vertical information section and a subordinate vertical information section (X1, X2, X4) arranged in parallel with the reference vertical information section, the first and second tape housing areas each having a generally circular shape in a plan view, the first and second tape housing areas being aligned with each other in the left-and-right direction such that outer peripheral edges of the first and second tape housing areas contact with each other, the reference vertical information section including a reference line that is an imaginary line extending along the front-rear direction and passing through a contact point of the outer peripheral edges of the first and second tape housing areas; and at least one aperture provided in the plurality of lateral information sections (Y1 and Y2) is provided in at least one of the reference vertical information section and the subordinate vertical information sections (X1, X2, X4) and builds a pattern, the pattern indicates the color information relating to the at least one tape.