To provide a concrete spraying machine which can prevent inside concrete or the like from leaking to the outside even if the number of times of uses has been increased due to a long-term use.

The concrete spraying machine has a raw material supply port 7, a casing 2, a drive shaft 9, a rotation plate 11 at the driven side, a motor 12, and a rotation plate 13 at the drive side. The raw material supply port is used for supplying concrete materials, and the casing 2 has a discharge port 16 and an air supply port 14. The discharge port is used for discharging manufactured concrete to the outside, and the air supply port is used for supplying air. The drive shaft is arranged in the casing 2 with possible rotation and provided with a plurality of agitation blades 10. The rotation plate 11 at the driven side is installed on the outer periphery at one end side of the drive shaft 9 coaxially with the drive shaft 9, and the motor 12 is arranged outside one side of the casing where the rotation plate at the driven side is arranged. The rotation plate at the drive side is connected to the rotary shaft 1201 of the motor coaxially with the rotary shaft 1201. The rotation plate 11 a the driven side and the rotation plate 13 at the drive side are formed of magnets, and the drive shaft 9 can be rotated by a magnetic force by driving the motor 12.