To provide a flour grinding machine which enables anyone to easily assemble and disassemble the machine by decreasing the number of parts.

The flour grinding machine comminutes the material to be comminuted by means of a mortar 12 housed in a case 11. This flour grinding machine has the mortar 12, a motor 18 for rotating this mortar 12, a case body 11a housing the motor 18, a cover 11b made freely attachable and detachable to and from the case body 11a, an annular receiving container 14 stored with the comminuted matter discharged from the circumference of the mortar 12 and a scraping section 19 for scraping the comminuted matter stored in the receiving container 14. The receiving container 4 is integrally formed in the case body 11a and the case body 11a is commonly used as the receiving container 14. The number of parts is decreased and anyone is able to easily assemble and disassemble the machine.