A tape printer that includes a tape cassette having a housing, a tape, a head holder insertion portion, and a first support receiving portion that is a first indentation extending from the bottom surface in a direction toward the top surface, a cassette housing portion in which the tape cassette is inserted or removed, a head holder extending from the cassette housing portion in a direction of insertion and removal of the tape cassette with respect to the cassette housing portion and supporting a printhead, the head holder being adapted to be inserted in the head holder insertion portion, and a first supporting portion provided on the head holder to support a ceiling wall portion of the first indentation as the first support receiving portion, the first supporting portion being provided on an upstream side of the printhead in a feed direction of the tape.