Chlorinated vinyl chloride-based resin

A chlorinated polyvinyl chloride resin,

• comprising three components including a A150 component, a B150 component, and a C150 component, and
• having a percentage of the C150 component (C150 component/(A150 component+B150 component+C150 component)) of less than 8.0%,
• the three components being identified by measuring the chlorinated polyvinyl chloride resin by a solid echo method using pulse NMR at 150° C. to give a free induction decay curve of 1H spin-spin relaxation, and subjecting the free induction decay curve to waveform separation into three curves derived from the A150 component, the B150 component, and the C150 component in order of shorter relaxation time using the least square method,
• wherein the chlorinated polyvinyl chloride resin has an amount of added chlorine of 6.2% by mass or more and 12.2% by mass or less, and
• the chlorinated polyvinyl chloride resin contains units (a) to (c) represented by the following formulas (a) to (c), and a proportion of the structural unit (b) is 15.0 mol % or higher and 30.0 mol % or lower, relative to a total number of moles of the structural units (a) to (c)
• —CH2—CHCl— (a)
• —CH2—CCl2— (b)
• —CHCl—CHCl— (c).