A handy printer and a mobile phone based on the use of the same are provided, wherein the printing can be performed on recording paper sheets having various sizes. The handy printer comprises a cover member which is movable between an exposure position at which an ink discharge surface of an ink discharge head is exposable to the outside and a cover position at which the discharge surface is hidden from the outside. When the cover member is positioned at the cover position, the recording is permitted on a recording paper sheet accommodated in a recording paper-accommodating mechanism. When the cover member is positioned at the exposure position, the recording is permitted on a recording medium disposed outside a handy-printer body casing.