PURPOSE: To provide a weighing and classifying apparatus capable of weighing fishes and shellfishes to classify them with good maintenance.

CONSTITUTION: Three weighing plates 107 are arranged so as to provide intervals therebetween and the receiving part T receiving the scallop M supplied from the scallop chain belt conveyor 78 provided above the weighing plates is formed. The load cell 111 weighing the scallop M of the receiving part T is arranged to the upper part and three discharge plates 114 arranged so as to be capable of pass through the gaps between those weighing plates 107 are driven by a crank mechanism and, when the discharge plates 114 pass through the gaps during the driving process, the scallops M weighed in the receiving part T is pressed to be supplied to each of buckets 35 from the receiving part T. The buckets 35 are pivotally supported on the chains of a chain conveyor 32 in a freely rotatable manner and inclined at each area by measured wts. during feed to classify the scallop M to discharge the same.