Abstract: A lens barrel is provided with: a fixed barrel including a first straight guide; a cam cylinder supported by the fixed barrel and including a cam groove formed on an internal circumference of the can cylinder; a front cylinder including a lens, a can pin for being engaged with the cam groove, and at least three extended portions formed by partly extending an end surface of the front cylinder; and a straight guide member engaged with the first straight guide. When the lens barrel reaches a second state from a first state, an end surface of each of the extended portions is positioned closer to the image plane side than an object side surface of a predefined region of the straight guide member.