To provide a small sized and lightweight new agitating and spin-down device for physical and chemical experiments having no possibility of causing failures.

In this agitating and spin-down device in physical and chemical apparatus, an eccentric cam is provided at the lower face of a movable shaft, two inner and outer one-way clutches controlling rotation and non-rotation are provided between the movable shaft and a rotor stage fit to the upper part, and shaft alignment is performed by making an eccentric amount zero by winding of the eccentric cam accompanied with the normal rotation of a power shaft. A head rubber on the rotor stage is rotated by the rotation control of the one-way clutch, the shaft alignment is released by return of the eccentric cam to the original position accompanied with reverse rotation of the power shaft, the head rubber is switched to vibration by the non-rotation control of the one-way clutch to vibrate and agitate liquid in a test tube on the head rubber, and then agitation liquid attached to the inner face of the test tube is spun down by switching the head rubber to rotation.

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