A thermal printer, comprising: a casing including: a roll sheet receiving portion that allows a roll sheet, which is obtained by winding a recording sheet, to be loaded into the roll sheet receiving portion; and a delivery slot through which a portion of the recording sheet drawn from the roll sheet 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; and a platen roller configured to convey the recording sheet toward the delivery slot while sandwiching the recording sheet 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, and configured to press the roll sheet in a direction of separating away from the delivery slot through abutment against an outer peripheral surface of the roll sheet; and an urging member configured to urge the flap about the first axis 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 along a center axis of the roll sheet, and allowed to be brought into abutment against the recording sheet. a casing including: a roll sheet receiving portion that allows a roll sheet, which is obtained by winding a recording sheet, to be loaded into the roll sheet receiving portion; and a delivery slot through which a portion of the recording sheet drawn from the roll sheet is delivered to an outside of the thermal printer; a roll sheet receiving portion that allows a roll sheet, which is obtained by winding a recording sheet, to be loaded into the roll sheet receiving portion; and a delivery slot through which a portion of the recording sheet drawn from the roll sheet 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; and a platen roller configured to convey the recording sheet toward the delivery slot while sandwiching the recording sheet 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; and a platen roller configured to convey the recording sheet toward the delivery slot while sandwiching the recording sheet 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, and configured to press the roll sheet in a direction of separating away from the delivery slot through abutment against an outer peripheral surface of the roll sheet; and an urging member configured to urge the flap about the first axis 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 along a center axis of the roll sheet, and allowed to be brought into abutment against the recording sheet.