An endodontic file holder, wherein the endodontic file holder is a holder for holding an endodontic file for dental treatment and comprises: a wearing member worn on a part of a body; a holder body mounted on an outer side of the wearing member, having an inner side in which an accommodating space for accommodating a sponge is formed, and having openings through which the sponge accommodated in the accommodating space is exposed; a sponge inserted inside of the accommodating space formed in the holder body, the sponge being suitable for inserting an endodontic file therein; and a length measuring means configured to measure a length of an endodontic file, characterized in that at least one medicine receiving groove for accommodating a medicine for dental treatment to be applied to an endodontic file is formed on an upper surface of the holder body, the length measuring means is provided in the holder body, the holder body comprises a housing and a body, the housing having a through hole penetrating both sides of a lower end thereof so that the wearing member is mounted thereon, wherein either a magnet is accommodated inside the housing and the body is made of a metal material having a property of being attached to a magnet, or wherein the housing is formed of a metal material having a property of being attached to a magnet and the body has a magnet accommodated therein so that a lower surface of the body is detachably attached to an upper surface of the housing, the body having the inner side in which the accommodating space for accommodating the sponge is formed, and having the openings through which the sponge accommodated in the accommodating space is exposed, and the wearing member is a band-type wrist strap made of an elastic material configured to pass through the through hole formed in the housing and worn on a wrist. a wearing member worn on a part of a body; a holder body mounted on an outer side of the wearing member, having an inner side in which an accommodating space for accommodating a sponge is formed, and having openings through which the sponge accommodated in the accommodating space is exposed; a sponge inserted inside of the accommodating space formed in the holder body, the sponge being suitable for inserting an endodontic file therein; and a length measuring means configured to measure a length of an endodontic file, characterized in that at least one medicine receiving groove for accommodating a medicine for dental treatment to be applied to an endodontic file is formed on an upper surface of the holder body, the length measuring means is provided in the holder body, the holder body comprises a housing and a body, the housing having a through hole penetrating both sides of a lower end thereof so that the wearing member is mounted thereon, wherein either a magnet is accommodated inside the housing and the body is made of a metal material having a property of being attached to a magnet, or wherein the housing is formed of a metal material having a property of being attached to a magnet and the body has a magnet accommodated therein so that a lower surface of the body is detachably attached to an upper surface of the housing, the body having the inner side in which the accommodating space for accommodating the sponge is formed, and having the openings through which the sponge accommodated in the accommodating space is exposed, and the wearing member is a band-type wrist strap made of an elastic material configured to pass through the through hole formed in the housing and worn on a wrist.