A printing device with a manual paper feeding function includes a manual paper feeding unit which feeds a plurality of papers, a size sensor which detects a paper size of a fed paper, a paper size error determining unit that determines a presence or an absence of a paper size error in accordance with a detected paper size of the fed paper and a set size, a next page determining unit that determines a presence or an absence of a next page to be printed in accordance with the determination of the presence of the paper size error in case of a manual paper feeding operation and a control unit that ignores the determination of the presence of the paper size error in case of the absence of the next page to be printed.