Provided is a sheath for introducer having a high centering performance that is easily capable of introducing an elongated body such as a catheter into an appropriate position, and a sheath for introducer that is capable of appropriately maintaining hemostasis and insertibility of a valve body. The sheath 10 for introducer includes a tubular member 20 provided with a hallow section 21 through which an elongated body 100 is freely insertable, a hub 30 that includes an inner space 33 which communicates with the hollow section 21 of the tubular member 20 and is provided on a proximal side of the tubular member 20, a valve body 40 that is placed in the inner space 33 of the hub 30, and an annular member 50 that contacts with the valve body 40 to fix the valve body 40 to the inner space 33 and includes a through-hole 51 into which the elongated body 100 can be inserted.
