A medical device, comprising: an elongated resin medical device body which is flexible and is inserted into a body cavity; a sub-lumen which is disposed inside the medical device body so as to extend along a longitudinal direction of the medical device body; an operation wire which is inserted into the sub-lumen and extends along the longitudinal direction of the medical device body, and in which the medical device body is bent through a pulling operation with respect to the operation wire; a first tubular reinforcing layer and a second tubular reinforcing layer which are embedded in the medical device body such that axial directions of the reinforcing layers (50, 51) extend along an axial direction of the medical device body, to reinforce the medical device body; a first marker which is provided at a distal portion of the medical device body and is formed of a radiopaque material; and a second marker which is provided further on a proximal side than the first marker in the distal portion of the medical device body and is formed of a radiopaque material, wherein the second reinforcing layer is disposed apart from the first reinforcing layer so as to surround the periphery of the first reinforcing layer, wherein the space between the first reinforcing layer and the second reinforcing layer is filled with a part of a resin constituting the medical device body, wherein the sub-lumen is disposed inside the part of the resin, wherein a tip end portion of the operation wire is fixed further on a distal side than the second marker in the medical device, wherein at least one of the first reinforcing layer and the second reinforcing layer is disposed over an area where the first marker is disposed, wherein a distal end of the second reinforcing layer is positioned further on the proximal side of the medical device body than the area where the first marker is disposed, and wherein a distal end of the first reinforcing layer is positioned further on the distal side of the medical device body than a proximal end of the area where the first marker is disposed. an elongated resin medical device body which is flexible and is inserted into a body cavity; a sub-lumen which is disposed inside the medical device body so as to extend along a longitudinal direction of the medical device body; an operation wire which is inserted into the sub-lumen and extends along the longitudinal direction of the medical device body, and in which the medical device body is bent through a pulling operation with respect to the operation wire; a first tubular reinforcing layer and a second tubular reinforcing layer which are embedded in the medical device body such that axial directions of the reinforcing layers (50, 51) extend along an axial direction of the medical device body, to reinforce the medical device body; a first marker which is provided at a distal portion of the medical device body and is formed of a radiopaque material; and a second marker which is provided further on a proximal side than the first marker in the distal portion of the medical device body and is formed of a radiopaque material, wherein the second reinforcing layer is disposed apart from the first reinforcing layer so as to surround the periphery of the first reinforcing layer, wherein the space between the first reinforcing layer and the second reinforcing layer is filled with a part of a resin constituting the medical device body, wherein the sub-lumen is disposed inside the part of the resin, wherein a tip end portion of the operation wire is fixed further on a distal side than the second marker in the medical device, wherein at least one of the first reinforcing layer and the second reinforcing layer is disposed over an area where the first marker is disposed, wherein a distal end of the second reinforcing layer is positioned further on the proximal side of the medical device body than the area where the first marker is disposed, and wherein a distal end of the first reinforcing layer is positioned further on the distal side of the medical device body than a proximal end of the area where the first marker is disposed.