An ice making section of a stream down type ice making machine for enabling easy cleaning between a pair of ice making plates and for enabling individual replacement of every component, thereby reducing the cost of replacement.A plurality of mounting members 16 are provided on an evaporation pipe 14 in parallel being separated at a predetermined interval in the extending direction of a linear part 14. Each of parts to be engaged 16b, 16b is formed at an open end of each mounting member 16. At an open end of each ice making member 18 formed into generally U-shaped by bending, each engagement part 22d which is engageable with and disengageable from the part to be engaged 16b is formed. By assembling the ice making member 18 between the mounting members 16, 16 adjacent to each other so as to engage each engagement part 22d with the corresponding part to be engaged 16b, a first ice making section is configured so that the pair of ice making plates are oppositely arranged across the evaporation pipe 14.