An endoscope system for retrieving a capsule endoscope comprising: an endoscope which includes: an insertion section having a distal end and a proximal end and configured to be inserted into a body cavity of a patient; an operation section arranged at the proximal end of the insertion section; a receptacle which is provided in the distal end of the insertion section of the endoscope and configured to hold the capsule endoscope in order to retrieve the same; a suction mechanism configured to hold the capsule endoscope in the receptacle; and an observation optical system provided at the distal end of the insertion section, characterized in that the endoscope further comprises a hood attached to the distal end of the insertion section, the hood comprising a connection part, a receptacle inlet port, and a projecting part connecting the connection part with the receptacle inlet port, wherein the connecting part is mounted on the outer circumferential surface of the distal part of the insertion section and is secured thereto, and the receptacle inlet port is elastic and composed of a plurality of claws projecting from the distal end of the projecting part toward the axis of the hood. an endoscope which includes: an insertion section having a distal end and a proximal end and configured to be inserted into a body cavity of a patient; an operation section arranged at the proximal end of the insertion section; a receptacle which is provided in the distal end of the insertion section of the endoscope and configured to hold the capsule endoscope in order to retrieve the same; a suction mechanism configured to hold the capsule endoscope in the receptacle; and an observation optical system provided at the distal end of the insertion section, characterized in that the endoscope further comprises a hood attached to the distal end of the insertion section, the hood comprising a connection part, a receptacle inlet port, and a projecting part connecting the connection part with the receptacle inlet port, wherein the connecting part is mounted on the outer circumferential surface of the distal part of the insertion section and is secured thereto, and the receptacle inlet port is elastic and composed of a plurality of claws projecting from the distal end of the projecting part toward the axis of the hood. an insertion section having a distal end and a proximal end and configured to be inserted into a body cavity of a patient; an operation section arranged at the proximal end of the insertion section; a receptacle which is provided in the distal end of the insertion section of the endoscope and configured to hold the capsule endoscope in order to retrieve the same; a suction mechanism configured to hold the capsule endoscope in the receptacle; and an observation optical system provided at the distal end of the insertion section, characterized in that the endoscope further comprises a hood attached to the distal end of the insertion section, the hood comprising a connection part, a receptacle inlet port, and a projecting part connecting the connection part with the receptacle inlet port, wherein the connecting part is mounted on the outer circumferential surface of the distal part of the insertion section and is secured thereto, and the receptacle inlet port is elastic and composed of a plurality of claws projecting from the distal end of the projecting part toward the axis of the hood.