To provide a stirring device that has high durability while preventing the bite of foreign matters.

A paddle 60 is provided with a brush holder 61 and a brush 62. The brush holder 61 fixes the brush 62 by clamping the brush 62. The brush 62 is formed by bundling with a fixing plate not shown a large number of metal wires 62a such as a spring steel formed in a coil shape as shown in (c). The brush 62 can mix soil and sand almost without being bent because the metal wire 62a of the brush 62 has rigidity so that it is hardly bent by the load to scrape up the soil and sand not containing foreign matters. However, the brush 62 passes above the foreign matters 50 in a bent state when the foreign matters such as a metal and the like, which can not be removed in the previous step, are included in the sand and soil to be mixed. The brush 62 passing above the foreign matters restores the original shape by the elastic force.