A tape printer (1) has a head holder (74) extending upwards from a cassette housing portion (8) adapted to house a tape cassette (30). The head holder (74), on which a thermal head (10) is mounted, can be inserted in a head insertion portion (39) of the tape cassette (30). Cassette supporting portions (741 and 742) are respectively provided at a predetermined height position on a right end and a left end of the head holder (74). The tape cassette (30) has support receiving portions (391 and 392) respectively connected to an upstream end and a downstream end of the head insertion portion (39) in a feed direction of a mounted tape, facing the head insertion portion (39). When the tape cassette (30) is installed in the tape printer (1), the cassette support portions (741 and 742) respectively support the support receiving portions (391 and 392) from underneath.
