By promptly separating ice blocks from ice making plates, ice making capacity is improved and also downsizing is sought. Ice making portions 10 are provided with a pair of ice making plates 14, 14 disposed vertically and an evaporation tube 16 disposed between back faces, facing each other, of both ice making plates 14, 14. On surfaces of the ice making plates 14, a plurality of vertically extending projected rims 18 are formed at a predetermined interval across the width, and by these projected rims 18, a plurality of ice making regions 20 are spaced apart widthwise and the plurality of them are defined. The ice making plates 14 facing the ice making regions 20 are configured to be provided consecutively with vertically multi steps of inclined portions 22 inclined from a back side towards a front side as directed downwardly, and are disposed to make contact with horizontal extensions 16a of the evaporation tube 16 at an approximately vertically intermediate position on a back face of each inclined portion 22.