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 mounted within the housing , the housing directing the tape 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 , each of the plurality of indicator portions 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 , the separating wall guiding the tape along a tape feed path of the tape 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 mounted within the housing , the housing directing the tape 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 , each of the plurality of indicator portions 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 , the separating wall guiding the tape along a tape feed path of the tape 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 , the separating wall guiding the tape along a tape feed path of the tape 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 . <EOS>