(57) [summary] [purpose] two of the movable member is one of the driving means by the left and right opposite directions and accuracy is good and easy handling and a linear actuation unit that is precisely driven compact inexpensive linear actuation unit I provide. [Configuration] as well as screwed independently each nut block in this left-hand thread portion and the right-hand screw portion is provided on the left threaded portion and the right threaded portion to one of the feed screw, provided with a nut block of each the guide rail rolling rolling elements disposed between the rolling element rolling grooves provided in the element rolling groove and the nut block, the nut block is slidable in the axial direction via the rolling of the rolling elements. [Effect] One of the control of the feed screw it is possible to obtain left and right opposite precise operation of the two nuts blocks, moreover, it requires less also bulky parts are easy to handle because they are built on the same guide rail.
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