A ferrule for use in a fitting to be connected to a pipe, the fitting including: a first member having a through hole for receiving the pipe; and a second member having a through hole for receiving the pipe, the second member being coupled by screw coupling with the first member, with a central axis of the through hole being aligned with a central axis of the through hole of the first member, the ferrule comprising: a through hole penetrating from a first end portion of the ferrule to a second end portion of the ferrule for receiving the pipe, a portion having a greater inner diameter than the first end portion and the second end portion being provided between the first end portion and the second end portion; a rising portion including the first end portion; wherein the rising portion is inwardly tapered, a pressed portion located closer to the second end portion than the rising portion; wherein the pressed portion is inwardly taprered and an intermediate portion including a portion where an inner diameter is greater than the first end portion and the second end portion, wherein the intermediate portion is cylindrical, the intermediate portion connecting together the rising portion and the pressed portion, wherein the ferrule is configured to be placed in an accommodation space, with a central axis of the through hole being aligned with central axes of the first member and the second member, the accommodation space being formed by an inner circumferential surface of the first member having a first tapered inner circumferential surface, which is an inner circumferential surface having a tapered shape, to be in contact with the first end portion of the ferrule, an inner circumferential surface of the second member having a pressing portion for pressing at least a portion of the pressed portion of the ferrule and for pressing the ferrule to increase an outer diameter of the intermediate portion, and an outer circumferential surface of the pipe, and the accommodation space having a first clearance space for accommodating the ferrule therein and allowing the rising portion to rise so as to increase an angle of the rising portion with respect to the outer circumferential surface of the pipe; and as the screw coupling between the first member and the second member is tightened, the rising portion of the ferrule rises, because of said increase of an outer diameter of the intermediate portion, to rotate, with an outer circumference of the first end portion serving as a fulcrum and an inner circumference of the first end portion serving as a point of load, thereby implementing a drive to bite into an outer circumference of the pipe based on the principle of leverage. a through hole penetrating from a first end portion of the ferrule to a second end portion of the ferrule for receiving the pipe, a portion having a greater inner diameter than the first end portion and the second end portion being provided between the first end portion and the second end portion; a rising portion including the first end portion; wherein the rising portion is inwardly tapered, a pressed portion located closer to the second end portion than the rising portion; wherein the pressed portion is inwardly taprered and an intermediate portion including a portion where an inner diameter is greater than the first end portion and the second end portion, wherein the intermediate portion is cylindrical, the intermediate portion connecting together the rising portion and the pressed portion, wherein the ferrule is configured to be placed in an accommodation space, with a central axis of the through hole being aligned with central axes of the first member and the second member, the accommodation space being formed by an inner circumferential surface of the first member having a first tapered inner circumferential surface, which is an inner circumferential surface having a tapered shape, to be in contact with the first end portion of the ferrule, an inner circumferential surface of the second member having a pressing portion for pressing at least a portion of the pressed portion of the ferrule and for pressing the ferrule to increase an outer diameter of the intermediate portion, and an outer circumferential surface of the pipe, and the accommodation space having a first clearance space for accommodating the ferrule therein and allowing the rising portion to rise so as to increase an angle of the rising portion with respect to the outer circumferential surface of the pipe; and as the screw coupling between the first member and the second member is tightened, the rising portion of the ferrule rises, because of said increase of an outer diameter of the intermediate portion, to rotate, with an outer circumference of the first end portion serving as a fulcrum and an inner circumference of the first end portion serving as a point of load, thereby implementing a drive to bite into an outer circumference of the pipe based on the principle of leverage.