An object of the present invention is to predict the length of a stent placed in a blood vessel after placement. A stent length prediction apparatus 100 starts placement of a stent for treating an aneurysm in which a plurality of metal wires are spirally knitted on a three-dimensional blood vessel image representing a three-dimensional shape of a blood vessel. An indwelling start position specifying unit that receives a designation of a position and identifies an indwelling start position of the stent, and an indwelling that specifies designation of the indwelling direction of the stent from a user on a three-dimensional blood vessel image and specifies the indwelling direction of the stent Stent specification specification that specifies direction specification means, stent expanded diameter, stent expanded length, number of wires constituting stent, and pitch length of stent wires after stent expansion as stent specifications Means, the specification of the stent specified by the stent specification specifying means, and the indwelling position start position specified by the indwelling start position specifying means Comprising al, based on the blood vessel diameter of the indwelling direction of the blood vessel identified by the indwelling direction specifying means, and a detention after stent length calculating means for calculating a length after placement of the stent to expand to fit the blood vessel diameter. [Selection] Figure 1
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