A thermal printer , comprising: a casing including: a roll sheet receiving portion that allows a roll sheet (R), which is obtained by winding a recording sheet (P), to be loaded into the roll sheet receiving portion ; and a delivery slot through which a portion of the recording sheet (P) drawn from the roll sheet (R) is delivered to an outside of the thermal printer ; a printing unit including: a thermal head provided in a space of the casing between the roll sheet receiving portion and the delivery slot , and configured to perform printing on the recording sheet (P); and a platen roller configured to convey the recording sheet (P) toward the delivery slot while sandwiching the recording sheet (P) between the thermal head and the platen roller ; a flap provided on a portion of the casing between the printing unit and the roll sheet receiving portion so as to be pivotable about a first axis (O2), and configured to press the roll sheet (R) in a direction of separating away from the delivery slot through abutment against an outer peripheral surface of the roll sheet (R); and an urging member configured to urge the flap about the first axis (O2) in the direction of separating away from the delivery slot , characterized in that the thermal printer further comprises: a flap roller provided at a distal end portion of the flap , and configured so as to be rotatable about a second axis (O3) along a center axis of the roll sheet (R), and allowed to be brought into abutment against the recording sheet (P). a casing including: a roll sheet receiving portion that allows a roll sheet (R), which is obtained by winding a recording sheet (P), to be loaded into the roll sheet receiving portion ; and a delivery slot through which a portion of the recording sheet (P) drawn from the roll sheet (R) is delivered to an outside of the thermal printer ; a roll sheet receiving portion that allows a roll sheet (R), which is obtained by winding a recording sheet (P), to be loaded into the roll sheet receiving portion ; and a delivery slot through which a portion of the recording sheet (P) drawn from the roll sheet (R) is delivered to an outside of the thermal printer ; a printing unit including: a thermal head provided in a space of the casing between the roll sheet receiving portion and the delivery slot , and configured to perform printing on the recording sheet (P); and a platen roller configured to convey the recording sheet (P) toward the delivery slot while sandwiching the recording sheet (P) between the thermal head and the platen roller ; a thermal head provided in a space of the casing between the roll sheet receiving portion and the delivery slot , and configured to perform printing on the recording sheet (P); and a platen roller configured to convey the recording sheet (P) toward the delivery slot while sandwiching the recording sheet (P) between the thermal head and the platen roller ; a flap provided on a portion of the casing between the printing unit and the roll sheet receiving portion so as to be pivotable about a first axis (O2), and configured to press the roll sheet (R) in a direction of separating away from the delivery slot through abutment against an outer peripheral surface of the roll sheet (R); and an urging member configured to urge the flap about the first axis (O2) in the direction of separating away from the delivery slot , characterized in that the thermal printer further comprises: a flap roller provided at a distal end portion of the flap , and configured so as to be rotatable about a second axis (O3) along a center axis of the roll sheet (R), and allowed to be brought into abutment against the recording sheet (P). <EOS>