PURPOSE: To provide an apparatus capable of surely weighing even fishes and shellfishes such as scallop, shrimp or the like to sort the same while keeping good maintenance properties.

CONSTITUTION: Three weighing plates 107 are arranged so as to provide an interval to form an article receiving part T receiving a scallop M supplied from above and a load cell 111 are connected to the weighing plates 107 to be arranged above the article receiving part T and three discharge parts 114 arranged so as to be capable of passing the respective intervals S of the weighing plates are driven by the rotation of the cranks of crank mechanisms 91, 91' and, when the discharge plates 114 pass through the intervals S, the scallop M weighed by the load cell 111 in the article receiving part T is supplied to each of the buckets 35 of a bucket conveyor 32 from the article receiving part T. Both side wall parts of each bucket 35 having an almost triangular cross section are supported in a freely revolvable manner by a pair of chains and inclined upwardly in this state.