A tape cassette intended to be inserted into a tape printer having a plurality of detecting switches, the tape cassette comprising: a box-shape housing having a front wall, a top surface, and a bottom surface; a wound tape (55, 57, 59) mounted within the housing, the housing directing the tape (55, 57, 59) along a path to an exit, at least a portion of the path extending parallel to the front wall; an arm portion having an arm front surface provided with an arm indicator portion, characterised in that the arm indicator portion includes a plurality of indicator portions (801, 802), each of the plurality of indicator portions (801, 802) being a pressing portion or a non-pressing portion; and in that the tape cassette further comprises: a plate-shaped separating wall provided inside the tape cassette and provided between the path and the arm front surface, the separating wall extending from the top surface to the bottom surface of the housing and being generally parallel to a print surface of the tape (55, 57, 59), the separating wall guiding the tape (55, 57, 59) along a tape feed path of the tape (55, 57, 59) inside the arm portion, wherein when the tape cassette is installed in a cassette housing portion of the tape printer, a pressing portion contacts with one of the plurality of detecting switches of the tape printer, and another of the plurality of detecting switches other than the one of the plurality of detecting switches is inserted into a space between the arm front surface and the separating wall at the non-pressing portion. a box-shape housing having a front wall, a top surface, and a bottom surface; a wound tape (55, 57, 59) mounted within the housing, the housing directing the tape (55, 57, 59) along a path to an exit, at least a portion of the path extending parallel to the front wall; an arm portion having an arm front surface provided with an arm indicator portion, characterised in that the arm indicator portion includes a plurality of indicator portions (801, 802), each of the plurality of indicator portions (801, 802) being a pressing portion or a non-pressing portion; and in that the tape cassette further comprises: a plate-shaped separating wall provided inside the tape cassette and provided between the path and the arm front surface, the separating wall extending from the top surface to the bottom surface of the housing and being generally parallel to a print surface of the tape (55, 57, 59), the separating wall guiding the tape (55, 57, 59) along a tape feed path of the tape (55, 57, 59) inside the arm portion, wherein when the tape cassette is installed in a cassette housing portion of the tape printer, a pressing portion contacts with one of the plurality of detecting switches of the tape printer, and another of the plurality of detecting switches other than the one of the plurality of detecting switches is inserted into a space between the arm front surface and the separating wall at the non-pressing portion. a plate-shaped separating wall provided inside the tape cassette and provided between the path and the arm front surface, the separating wall extending from the top surface to the bottom surface of the housing and being generally parallel to a print surface of the tape (55, 57, 59), the separating wall guiding the tape (55, 57, 59) along a tape feed path of the tape (55, 57, 59) inside the arm portion, wherein when the tape cassette is installed in a cassette housing portion of the tape printer, a pressing portion contacts with one of the plurality of detecting switches of the tape printer, and another of the plurality of detecting switches other than the one of the plurality of detecting switches is inserted into a space between the arm front surface and the separating wall at the non-pressing portion.