To enable to perform stirring operation for plural samples at the same time, to miniaturize and to reduce occupancy area.

A driving motor having a vertical upward rotary shaft 14, driving magnets 18 arranged on the rotary shaft in two upper and lower stages to be horizontally rotated in the direction of S poles and N poles different from each other at 180°, a stirring vessel holder 12 provided with plural stirring vessel mounting holes 24 to surround the rotation region of the driving magnet, the bottomed cylindrical stirring vessel 26 vertically held by each stirring vessel mounting hole and rod like permanent magnetic stirrers 32 are provided. A driving part 10 has a closed structure formed by surrounding with a projecting case 20 and capable of freely attaching and detaching the stirring vessel holder. The stirring vessel is obtained by integrally molding a test tube shaped vessel main body and an elliptic opening part with a synthetic resin and the opening part is preferably formed into an elastically deformable long circular shape. The minor diameter of the opening part in the normal state is set to be smaller than the major diameter of the permanent magnetic stirrer.