PURPOSE: To provide a pen holder with a copy structure for performing accurate marking operation easily even if an object to be marked has a bent surface and the like.

CONSTITUTION: A guide member 4 and a guide shaft 5 for guiding a supporting member 3 for up and down are mounted in a vertical shaft direction of a holding member 1 and a compression spring 8 for energizing both holding member 1 and the supporting member 3 to repulsion direction is mounted between this guide member 4 and the supporting member 3. A pen holder body 11 for supporting a marking pen 2 to the supporting member 3 is mounted for oscillating and a pair of cam follower 14 for oscillating along a marking surface is mounted with held it between the pen in this pen holder body 11.