<p>Disclosed is an ice making machine wherein slush ice can be prevented from occurring while an increase of the manufacturing cost is suppressed. An ice making machine (M) is provided with an operation switching means (C1) which switches a circulation pump (25) from a continuous operation to an intermittent operation by detecting a predetermined first setup temperature of a temperature detection means (38) which measures the temperature at the outlet of an evaporator which constitutes a refrigeration mechanism. Also, the ice making machine (M) is provided with a slush ice preventing means (C2) which stops the circulation pump (25) for a setup period of time and drives the circulation pump (25) for a setup period of time in the intermittent operation. Further, the ice making machine (M) is provided with a slush ice prevention extending means (C3) which returns the circulation pump to the continuous operation after performing a predetermined number of cycles in the intermittent operation by detecting a second setup temperature which is lower than the first setup temperature of the temperature detection means (38) and higher than 0°C in the intermittent operation.</p>
