To solve the problem that a highly viscous fluid cannot be mixed uniformly by a paddle which is shaped like a Chinese character 'shan'. In a paddle having an arm part 1 arranged outside a container A,and a paddle part 2 formed integrally with the tip of the arm part 1, and arranged inside the container A, the paddle part 2 has a horizontal part 3, vertical parts 4, 5 projecting upward from both end parts of the horizontal part 3, and a connection shaft part 6 to the arm part 1, projecting upward from the center of the horizontal part 3, since an inward projection part 7 is provided at the topedge of the vertical part 5, a mixing object W in a region corresponding to a non-flow region can be mixed by the inward projection part 7.