Disclosed is a lens barrel structure comprises: a base; a lens barrel
provided on the base; a lens moving mechanism provided in the lens
barrel, the lens moving mechanism supporting a lens movably in an optical
axis direction thereof and being supplied with a rotational drive force
thereby to move the lens in the optical axis direction; a lens drive
mechanism provided to the base, the lens drive mechanism supplying the
lens moving mechanism with the rotational drive force, and including a
motor including an output shaft, a drive gear provided to the output
shaft, and a gear train that meshes with the drive gear to supply motive
power of the motor to the lens moving mechanism; and a detecting
mechanism that detects a rotation speed of the motor. The detecting
mechanism includes a sensing plate that is provided to the output shaft
and that rotates integrally with the output shaft, and a detector that
detects rotation of the sensing plate; and of gears included in the gear
train, a first gear to mesh with the drive gear is supported in a
cantilever support manner on the side of the base.