To provide an agitator which can be made further light in weight.

An agitator 1 is configured in such a manner that tabular blades 17 are mounted in arms 15 radially extending from an agitation shaft 3. The agitator 1 includes the agitation shaft 3 and agitation impellers 5. Material constituting any one of the agitation shaft 3, the arm 15 and the blade 17 includes fiber-reinforced resin material which comprise resin material and reinforcing fiber material containing at least a carbon fiber, the volume content of the carbon fiber per fiber-reinforced resin material is 15% or more 75% or less.