The present invention comprises, when adjusting a breast substitute (10) for the preparation of breast reconstruction abreast female mold creating step (101) of transcribing the existing breast or the breast to be removed and creating a breast female mold (1) a receiving step (102) of receiving the breast substitute (10) in the concave portion (1a) of the breast female mold (1) so as to include excess part of the concave portion (1a) a size adjusting step or an indicating step of removing the excess part of the concave portion (1a) of the breast substitute (10) as an unwanted part (301) of the breast substitute (10), or indicating the boundary for removal, or folding back the excess part to make it smaller so that an excess part does not form, or indicating a base line for making the excess part smaller and a substitute preparing step (104) of unloading the breast female mold (1) and preparing as the breast substitute (10) after the size adjusting step or the indicating step. According to the present invention, a method for adjusting a breast reconstruction part is provided for the preparation of achieving good balance of appearance of the breasts after breast reconstruction.
