An ice making machine has a framework-shaped frame which encloses an ice making tray and a drive unit and a fixing portion which fixes the frame to an inner wall surface in a freezing compartment. The frame includes a first frame portion and a second frame portion opposed to each other in an X-axis direction and a third frame portion and a fourth frame portion opposed to each other in a Y-axis direction. The fixing portion protrudes upward from the third frame portion. The third frame portion contacts the inner wall surface when the frame is fixed to the freezing compartment. The fourth frame portion includes a plate portion which extends in the X-axis direction with a thickness direction directed to the Y-axis direction and connects the first frame portion and the second frame portion to each other and a plurality of ribs provided on the plate portion.