The present invention relates to a lens apparatus consisting of a fixed lens-barrel, first and second movable lens-barrels fitted into the inside and the outside of the fixed lens-barrel and more than two rolling element units provided between the first and second movable lens-barrels so that a plurality of movable lens-barrels can be moved straight and an image pickup apparatus thereof.;According to the lens apparatus of the present invention, the lens apparatus is constituted by including a first fixed lens-barrel (51) including a plurality of fixed-side first guide grooves (7A, 7B, 67) and fixed-side second guide grooves (66, 75A, 75B), a first movable lens-barrel (52) which is arranged at the outside of the fixed lens-barrel and also includes a plurality of movable-side first guide grooves (59A, 59B, 59C), a second movable lens-barrel (202) which is arranged at the inside of the fixed lens barrel and also includes a plurality of movable-side guide grooves (72, 73, 74), three of first rolling element units (53A, 53B, 53C) provided between the fixed-side first guide grooves and the movable-side first guide grooves, and three of second rolling element units (65A, 65B, 65C) provided between the fixed-side second guide grooves and the movable-side second guide grooves. The first movable lens-barrels (52) and the second movable lens-barrels (202) are supported to the one-group lens 211 and the two-group lens 212 in such a manner that they can be independently moved in the optical axis directions of the first and second lenses. According to the present invention, it is able to move a plurality of movable lens-barrels straight reliably and smoothly.
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