| 摘要 |
There is provided a collapsible lens barrel including plural barrels of different outside diameter from one another and enabled to move coaxially and perform relative movement in an axial direction, and an image-capturing optical system disposed within the plural barrels; wherein the image-capturing optical system includes at least two lens holding frames (1402, 1602, 1802) arranged in a direction of an optical axis of the image-capturing optical system; and, considering an object side is set as a front side and an opposite side is set as a rear side, each of a rearmost lens holding frame (1802), placed at a rearmost position, and one of the lens holding frames (1602) placed immediately in front of the rearmost lens holding frame (1802), are respectively movably supported by a corresponding guide mechanism (28) to move in the direction of the optical axis and to move in the direction of the optical axis by a corresponding drive mechanism (29).
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