The present invention provides a mechanical pencil where reliable knock operation is possible without a complex structure. The mechanical pencil (1) has an advancement section (14) and a slider section (13) that are placed inside a body (12). A chuck member (43) and a chuck ring (44) that can grip a predetermined lead (90) are provided at the advancement section (44), enabling the lead (90) to beadvanced. The slider section (13) is slideable relative to the body (12) and has a lead guide (32) and a lead friction member (31). The lead friction member (31) has friction between itself and the lead (90) and uses thermoplastic elastomer.