Provided is a medical actuator which is capable of remotely controlling a tool attached to the tip of an elongated pipe section to change the attitude thereof with high accuracy and preventing the friction between mutually contacting portions without having detrimental effects on a living body. The medical actuator includes an elongated spindle guide section (3), a tip member (2) provided at the tip thereof so as to be freely changeable in attitude, and a tool (1) rotatably attached to the tip member (2). The tip member (2) rotatably supports a spindle (13) that retains the tool (1). The spindle guide section (3) includes a rotating shaft (22) for transferring rotation to the spindle (13), and a guide hole (30a) which penetrates from end to end. The medical actuator allows an attitude control member (31) to be axially moved back and forth and thereby change the attitude of the tip member (2), the attitude control member (31) being retractably inserted in the guide hole (30a). A DLC film is formed on the surface of at least one mutually contacting portion of a plurality of parts, the parts moving relative to each other.Linvention porte sur un actionneur médical qui peut commander à distance un outil fixé à la pointe dune section de tuyau allongée, afin den modifier lorientation à grande précision et dempêcher le frottement entre des parties en contact les unes avec les autres sans avoir deffets nuisibles sur un corps vivant. Lactionneur médical comprend une section de guidage de mandrin (3) allongée, un élément de pointe (2) disposé au niveau de sa pointe de façon à pouvoir être modifié librement en orientation, et un outil (1) fixé de manière rotative à lélément de pointe (2). Lélément de pointe (2) porte de manière rotative un mandrin (13) qui retient loutil (1). La section de guidage de mandrin (3) comprend un arbre rotatif (22) pour le transfert dune rotation au mandrin (13), et un trou de guidage ((30a) qui pénètre de bout en bout. Lactionneur médical permet à u
