To provide a rotary feeder capable of preventing biting of a feeding object when feeding the feeding object from a storage vessel through the rotary feeder.

In this rotary feeder for storing and feeding the feeding object, a rotor pocket constituted by a blade plate and a side plate has a pyramid trapezoidal shape and/or a clearance in feeding object supply opening formed by the shortest interval between a tip of an upper part baffle plate in a feeding object supply part and a tip of the blade plate of the rotor pocket is set within a proper scope based on the relation of the feeding object and the maximum particle diameter and the relation of the feeding object and measurement precision.