A thermal printer comprising: a thermal head and a platen roller configured to perform printing while nipping and feeding a linerless label; a downstream-side wraparound prevention member disposed on a downstream side of a feeding direction, the downstream-side wraparound prevention member being configured to prevent the linerless label from rolling up to the platen roller; a fixing portion configured to rotatably support a roller shaft of the platen roller; and a support member configured to detachably support the fixing portion, wherein the downstream-side wraparound prevention member is assembled with the fixing portion fixedly in a rotational direction of the roller shaft, characterized in that the thermal printer (1 a) further comprises: an upstream-side wraparound prevention member disposed on an upstream side of the feeding direction, the upstream-side wraparound prevention member being configured to prevent the linerless label from rolling up to the platen roller; wherein the upstream-side wraparound prevention member is assembled rotatably with respect to the roller shaft; the downstream-side wraparound prevention member and the upstream-side wraparound prevention member are provided with a restriction mechanism (162, 173, 175); and the restriction mechanism (162, 173, 175) is configured to restrict relative rotation of the upstream-side wraparound prevention member with respect to the downstream-side wraparound prevention member. a thermal head and a platen roller configured to perform printing while nipping and feeding a linerless label; a downstream-side wraparound prevention member disposed on a downstream side of a feeding direction, the downstream-side wraparound prevention member being configured to prevent the linerless label from rolling up to the platen roller; a fixing portion configured to rotatably support a roller shaft of the platen roller; and a support member configured to detachably support the fixing portion, wherein the downstream-side wraparound prevention member is assembled with the fixing portion fixedly in a rotational direction of the roller shaft, characterized in that the thermal printer (1 a) further comprises: an upstream-side wraparound prevention member disposed on an upstream side of the feeding direction, the upstream-side wraparound prevention member being configured to prevent the linerless label from rolling up to the platen roller; wherein the upstream-side wraparound prevention member is assembled rotatably with respect to the roller shaft; the downstream-side wraparound prevention member and the upstream-side wraparound prevention member are provided with a restriction mechanism (162, 173, 175); and the restriction mechanism (162, 173, 175) is configured to restrict relative rotation of the upstream-side wraparound prevention member with respect to the downstream-side wraparound prevention member. an upstream-side wraparound prevention member disposed on an upstream side of the feeding direction, the upstream-side wraparound prevention member being configured to prevent the linerless label from rolling up to the platen roller; wherein the upstream-side wraparound prevention member is assembled rotatably with respect to the roller shaft; the downstream-side wraparound prevention member and the upstream-side wraparound prevention member are provided with a restriction mechanism (162, 173, 175); and the restriction mechanism (162, 173, 175) is configured to restrict relative rotation of the upstream-side wraparound prevention member with respect to the downstream-side wraparound prevention member.