Abstract: A surface wave motor built-in lens barrel has a manual focus adjusting mode and an autofocus adjusting mode. The lens barrel comprises a photographing optical system, a fixed drum, a surface wave motor so fitted to the fixed drum as to be rotatable about an optical axis and having a fixed member capable of generating surface waves and a moving member friction-contacting the fixed member, rotating about the optical axis by the surface waves and thereby capable of moving the photographing optical system and a manual operation member capable of moving the photographing optical system by an outside operation. The photographing optical system is, in the manual focus adjusting mode, moved when the moving member and the fixed member of the surface wave motor become integral and rotated interlocking with a manual operation of the manual operation member.