A tape roll is housed inside a cassette case. A first rotation body is provided on a first direction side of the tape roll and is positioned on a second direction side of a winding center of the tape roll. A first opening is provided on the second direction side of the first rotation body. An ink ribbon roll is provided on the second direction side of the first opening. A second rotation body is provided on the first direction side and the second direction side of a winding center of the ink ribbon roll. A first regulating part is provided on a fourth direction side of a predetermined path and is positioned on the fourth direction side of a first virtual line.

A tape roll is housed inside a cassette case. A first rotation body is provided on a first direction side of the tape roll and is positioned on a second direction side of a winding center of the tape roll. A first opening is provided on the second direction side of the first rotation body. An ink ribbon roll is provided on the second direction side of the first opening. A second rotation body is provided on the first direction side and the second direction side of a winding center of the ink ribbon roll. A first regulating part is provided on a fourth direction side of a predetermined path and is positioned on the fourth direction side of a first virtual line.

A printing apparatus includes a head mechanism including a thermal head; a ribbon conveyance unit that defines a conveyance path of a thermal transfer ribbon and conveys the thermal transfer ribbon along the conveyance path of the thermal transfer ribbon; and a medium conveyance unit that defines a conveyance path of a transfer target medium and conveys the transfer target medium along the conveyance path of the transfer target medium. Each of the conveyance path of the thermal transfer ribbon and the conveyance path of the transfer target medium includes a transfer position and a peeling position downstream of the transfer position, the transfer position being a position where the thermal transfer ribbon overlaid on the transfer target medium is subjected to heat and pressure from the thermal head, the peeling position being a position where the thermal transfer ribbon starts to be peeled away from the transfer target medium.

An auxiliary tape cassette includes: an auxiliary tape; and a case. The auxiliary tape is used for printing on a printing tape. The case accommodates therein at least a part of the auxiliary tape. The case has: a discharge opening; and a guide part. The discharge opening discharges the printing tape to an outside. The guide part guides the printing tape supplied from an outside of the case toward the discharge opening. The guide part has a curvature forming member that causes the printing tape to be curved such that a portion in a width direction of the printing tape is distended in a thickness direction by contacting the printing tape.

An auxiliary tape cassette includes: an auxiliary tape; and a case. The auxiliary tape is used for printing on a printing tape. The case accommodates therein at least a part of the auxiliary tape. The case has: a discharge opening; and a guide part. The discharge opening discharges the printing tape to an outside. The guide part guides the printing tape supplied from an outside of the case toward the discharge opening. The guide part has a curvature forming member that causes the printing tape to be curved such that a portion in a width direction of the printing tape is distended in a thickness direction by contacting the printing tape.

An auxiliary tape cassette includes: an auxiliary tape; a gear; and a case. The auxiliary tape is used for printing on a printing tape. The gear transmits a driving force from an outside. The case accommodates therein at least a part of the auxiliary tape and at least a part of the gear. The case has: a discharge opening; and a guide part. The discharge opening discharges the printing tape to an outside. The guide part guides the printing tape supplied from an outside of the case toward the discharge opening.

An auxiliary tape cassette includes: an auxiliary tape; a gear; and a case. The auxiliary tape is used for printing on a printing tape. The gear transmits a driving force from an outside. The case accommodates therein at least a part of the auxiliary tape and at least a part of the gear. The case has: a discharge opening; and a guide part. The discharge opening discharges the printing tape to an outside. The guide part guides the printing tape supplied from an outside of the case toward the discharge opening.