A peroral powder delivery device having a capsule holder for loading the capsule into a body is attached so as to be capable of advancing into and retracting from the inside of the body, the body has a cutter blade to make holes on both ends of the capsule as it advances into the body being held by the capsule holder, first and second air passageways having connection ports in communication with the holes in the capsule loaded in the body, the first air passageway has an inhaling port for inhaling the peroral powder in the capsule and the second air passageway has a suction valve that opens by the inhaling force from an inhaling port introduce air into the capsule.