Provided are a drug feeder favorably employable in a drug dispensing unit having no robot mechanism, and a drug dispensing unit employing such a drug feeder. A drug feeder 5 comprises a drug container 20 in which a powder medicine is accommodated, a container holding part 16 that holds the drug container 20, and a weight measurement means 25 for directly or indirectly measuring the weight of the drug container 20. The drug feeder 5 vibrates the drug container 20 to discharge the powder medicine from the drug container 20, and is able to detect a discharge amount of the powder medicine with the weight measurement means 25. The drug container 20 is provided with an opening/closing member for opening/closing a powder medicine discharge part, and further has an opening/closing mechanism part. The opening/closing mechanism part directly or indirectly imparts power to the opening/closing member and moves at least a...
