To provide a seesaw type actuator suitable for driving a multicylinder such as telescopic telescoping pole which is rather low in weight, low in cost, and can be telescoped in horizontal and slant directions as well as in vertical direction.

Two-series of telescopic multicylinders A and B in which one average inner diameter is larger than the other average inner diameter and the upper and lower ends of it are closed is filled with liquid medium 4, the lower ends of the two-series of cylinders are communicated with each other, and cylinders 21 and 22 larger in average inner diameter are telescoped by a mechanical means. Thus cylinders 11, 12, and 13 smaller in average inner diameter can be telescoped telescopically.