Provided are a virtual stent placement apparatus, a virtual stent placement method, and a virtual stent placement program that simplify an operation of virtually placing a stent in a blood vessel extracted from a medical image. An extraction unit (22) extracts a blood vessel region (30) from a three-dimensional image (V0). A display control unit (26) displays a three-dimensional image (V1) including the blood vessel region (30). The information acquisition unit (23) acquires information of the diameter of a virtual stent placed in the blood vessel region (30), a maximum contour length of the virtual stent, and a start position (S1) in a case in which the virtual stent is placed. A placement unit (24) places the virtual stent having a maximum contour length (L0) from the start position (S1) along a maximum contour line of the blood vessel region (30) in the blood vessel region (30).
