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A fitting includes: a first member; a second member coupled by screw coupling with the first member; and a ferrule placed in an accommodation space between the first member, the second member, and a pipe. The ferrule has a rising portion including a first end portion, a pressed portion located close

A fitting includes: a first member; a second member coupled by screw coupling with the first member; and a ferrule placed in an accommodation space between the first member, the second member, and a pipe. The ferrule has a rising portion including a first end portion, a pressed portion located closer to a second end portion than the rising portion, and an intermediate portion including a portion where an inner diameter is greater than the first end portion and the second end portion, the intermediate portion connecting together the rising portion and the pressed portion. The first member has 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. The second member has a pressing portion for pressing at least a portion of the pressed portion of the ferrule. The accommodation space provides a clearance for accommodating the ferrule and allowing the rising portion to rise so as to increase an angle of the rising portion.

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1. A fitting to be connected to a pipe, comprising: a first member having a through hole constructed and arranged to receive the pipe;a second member having a through hole constructed and arranged to receive the pipe, the second member being coupled by screw coupling with the first member, with a ce

1. A fitting to be connected to a pipe, comprising: a first member having a through hole constructed and arranged to receive the pipe;a second member having a through hole constructed and arranged to receive 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; anda ferrule having a through hole extending from a first end portion of the ferrule to a second end portion of the ferrule constructed and arranged to receive the pipe, the ferrule including a portion having a greater inner diameter than the first end portion and the second end portion between the first end portion and the second end portion, and the ferrule being placed in an accommodation space formed by an inner circumferential surface of the first member and an inner circumferential surface of the second member, with a central axis of the through hole being aligned with the central axes of the first member and the second member, whereinthe ferrule includes a rising portion including the first end portion, a pressed portion located closer to the second end portion than the rising portion, and an intermediate portion including a portion where an inner diameter is greater than the first end portion and the second end portion, the intermediate portion connecting together the rising portion and the pressed portion;the first member includes a first tapered inner circumferential surface having a tapered shape, constructed and arranged to be in contact with the first end portion of the ferrule;the second member includes a pressing portion for pressing at least a portion of the pressed portion of the ferrule;the accommodation space includes a first clearance space constructed and arranged to accommodate the ferrule therein and to allow 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; andas the screw coupling between the first member and the second member is tightened, the rising portion of the ferrule rises with an outer circumference of the first end portion serving as a fulcrum of the principle of leverage and an inner circumference of the first end portion serving as a point of load of the principle of leverage, causing the inner circumference of the first end portion to rotate to be driven to bite into an outer circumference of the pipe. 2. The fitting according to claim 1, wherein the accommodation space has a second clearance space for accommodating the ferrule therein and further allowing an outer diameter of the intermediate portion to increase 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. 3. The fitting according to claim 1, wherein as the screw coupling between the first member and the second member is tightened after a finger-tight state, a first force applied from the second member in an axial direction and a second force deriving from the first force and acting to widen the intermediate portion outwardly cause the pressed portion and the first end portion of the ferrule to come closer to each other, thereby causing the rising portion to rise, and driving the inner circumference of the first end portion to bite into the outer circumference of the pipe. 4. The fitting according to claim 3, wherein at least a portion of a stage during which the screw coupling is tightened, the inner circumference of the first end portion bites into the outer circumference of the pipe while moving back in an opposite axial direction to a direction of the first force. 5. The fitting according to claim 1, wherein when the screw coupling between the first member and the second member is in a finger-tight state, an outer circumferential surface of the rising portion of the ferrule forms a first angle with respect to the first tapered inner circumferential surface along a cross section that includes the central axis; anda ceiling surface of the accommodation space provided by the first member or the second member is in contact with the intermediate portion whose outer diameter has increased, with the rising portion of the ferrule having risen by the first angle. 6. The fitting according to claim 1, wherein a thickness of the first end portion of the ferrule is less than a length of the rising portion. 7. The fitting according to claim 1, wherein the outer circumference of the first end portion of the ferrule is R-chamfered. 8. The fitting according to claim 1, wherein the pressing portion of the second member has a second inner circumferential surface, which is an inner circumferential surface having a tapered shape, to be in contact with the second end portion of the ferrule; andwhen the screw coupling between the first member and the second member is in a finger-tight state, an outer circumferential surface of the pressed portion of the ferrule forms a predetermined second angle with respect to the second inner circumferential surface along a cross section that includes the central axis.