The present invention intends to provide an optical sorting machine which can improve the collection rate of non-defective products without increasing the size of the machine. The optical sorting machine of the present invention includes a granular object feed unit including storage means that stores an object to be sorted, and transfer means that transfers the object to be sorted from the storage means; an optical sorting unit including optical detection means that detects an object to be sorted falling along a predetermined trajectory from an end portion of the transfer means, determination means that determines a type of the object to be sorted based on a detection signal from the optical detection means, an ejector that removes an object to be sorted determined as a specific type from the predetermined falling trajectory based on a determination result by the determination means, and a discharge hopper having a first discharge passage provided at a falling position of the object to be sorted falling along the predetermined trajectory, a second discharge passage provided at a falling position of the object to be sorted removed from the predetermined falling trajectory, and a third discharge passage formed between the first discharge passage and the second discharge passage; and conveyance means that conveys an object to be sorted discharged from the third discharge passage of the discharge hopper in the optical sorting unit to the storage means of the granular object feed unit.