Provided is a capsule release device and a capsule release system by which a capsule endoscope can be accurately disposed in the large intestine by simple operation. The capsule release device 20 is provided with: a cylinder part 21 comprising a distal end part 212 in a cylindrical shape, which is formed in the distal end side of a cylindrical part 211 and the inner diameter of the end part in the side not in contact with the cylindrical part 211 of which is not larger than the outer diameter of a capsule endoscope 10, and a positioning part 213 for determining the position at which the capsule endoscope 10 is inserted into a subject, said positioning part 213 being formed in the outer peripheral side in the proximal end side of the cylindrical part 211 and a piston part 22 comprising an insertion part 221 which is to be inserted in a slidable manner into the cylindrical part 211, a pressing part 222, which is formed in the distal end side of the insertion part 221 and the outer diameter of which is larger than the outer diameter of the insertion part 221 but smaller than the inner diameter of the cylindrical part 211, and an operation part 223 which is formed in the proximal end side of the insertion part 221 and is larger than the outer diameter of the insertion part 221.Linvention concerne un dispositif de libération de capsule et un système de libération de capsule permettant de mettre précisément en place une capsule dendoscope dans le gros intestin par une opération simple. Le dispositif de libération de capsule (20) est pourvu : dune partie cylindre (21), comprenant une partie extrémité distale (212) de forme cylindrique, qui est formée sur le côté extrémité distale dune partie cylindrique (211) et dont le diamètre intérieur de la partie dextrémité du côté qui nest pas en contact avec la partie cylindrique (211) nest pas plus grand que le diamètre extérieur dun endoscope à capsule (10), et une partie de positionnement (213) pour déterminer la position au nive
