A prosthetic valve forming template (5, 15) for forming: i) a prosthetic valve having an annulus stitching part to be stitched to a mitral annulus, an anterior papillary muscle stitching part to be stitched to an anterior papillary muscle, and a posterior papillary muscle stitching part to be stitched to a posterior papillary muscle, or ii) a prosthetic valve having an annulus stitching part to be stitched to a tricuspid annulus, a medial papillary muscle stitching part to be stitched to a medial papillary muscle, and a posterior papillary muscle stitching part to be stitched to a posterior papillary muscle, or iii) a prosthetic valve having an annulus stitching part to be stitched or crimped to an aortic annulus, and two aortic wall stitching parts to be stitched to an aortic wall, or iv) a prosthetic valve having an annulus stitching part to be stitched or crimped to a pulmonary annulus, and two pulmonary artery wall stitching parts to be stitched to a pulmonary artery wall, the prosthetic valve forming template comprising: one base line (6, 16); two drooping lines (7, 17) suspending vertically from both ends of the base line; two sidelines (8, 18) extending respectively downward and inward in a semi-parabolic manner from lower ends of the two drooping lines (7, 17); two first horizontal lines (9, 19) extending respectively inward and horizontally from lower ends of the two sidelines (8, 18); two first curved lines (10, 20) extending respectively upward in a parabolic manner from inner ends of the two first horizontal lines; and for option i), iii) or iv): two second horizontal lines extending respectively inward and horizontally from inner ends of the two first curved lines; and one second curved line extending upward in a parabolic manner from inner ends of the two second horizontal lines, or for option ii): one second horizontal line connecting inner ends of the two first curved lines. i) a prosthetic valve having an annulus stitching part to be stitched to a mitral annulus, an anterior papillary muscle stitching part to be stitched to an anterior papillary muscle, and a posterior papillary muscle stitching part to be stitched to a posterior papillary muscle, or ii) a prosthetic valve having an annulus stitching part to be stitched to a tricuspid annulus, a medial papillary muscle stitching part to be stitched to a medial papillary muscle, and a posterior papillary muscle stitching part to be stitched to a posterior papillary muscle, or iii) a prosthetic valve having an annulus stitching part to be stitched or crimped to an aortic annulus, and two aortic wall stitching parts to be stitched to an aortic wall, or iv) a prosthetic valve having an annulus stitching part to be stitched or crimped to a pulmonary annulus, and two pulmonary artery wall stitching parts to be stitched to a pulmonary artery wall, the prosthetic valve forming template comprising: one base line (6, 16); two drooping lines (7, 17) suspending vertically from both ends of the base line; two sidelines (8, 18) extending respectively downward and inward in a semi-parabolic manner from lower ends of the two drooping lines (7, 17); two first horizontal lines (9, 19) extending respectively inward and horizontally from lower ends of the two sidelines (8, 18); two first curved lines (10, 20) extending respectively upward in a parabolic manner from inner ends of the two first horizontal lines; and for option i), iii) or iv): two second horizontal lines extending respectively inward and horizontally from inner ends of the two first curved lines; and one second curved line extending upward in a parabolic manner from inner ends of the two second horizontal lines, or for option ii): one second horizontal line connecting inner ends of the two first curved lines. one base line (6, 16); two drooping lines (7, 17) suspending vertically from both ends of the base line; two sidelines (8, 18) extending respectively downward and inward in a semi-parabolic manner from lower ends of the two drooping lines (7, 17); two first horizontal lines (9, 19) extending respectively inward and horizontally from lower ends of the two sidelines (8, 18); two first curved lines (10, 20) extending respectively upward in a parabolic manner from inner ends of the two first horizontal lines; and for option i), iii) or iv): two second horizontal lines extending respectively inward and horizontally from inner ends of the two first curved lines; and one second curved line extending upward in a parabolic manner from inner ends of the two second horizontal lines, or for option ii): one second horizontal line connecting inner ends of the two first curved lines. two second horizontal lines extending respectively inward and horizontally from inner ends of the two first curved lines; and one second curved line extending upward in a parabolic manner from inner ends of the two second horizontal lines, or for option ii): one second horizontal line connecting inner ends of the two first curved lines. one second horizontal line connecting inner ends of the two first curved lines.