The purpose of this study is to examine how the "modern family" value has been maintained in contemporary Japan. Contrary to other studies that describe the legitimization of this value as a reproductive process, this study aims to describe it as a process of survival, which assumes the existence of challenges to its legitimacy. It supposes the appearance of assisted reproductive technologies to be one of the challenges. Examining discourses on those technologies, it analyzes the transformation of rhetoric to allow this value to survive.
　The result of this study was as follows: until the early 1970's, this value had been justified by the "natural order" rhetoric; the view that a married couple must bring up their children because of right beyond personal will. However, the other view that people had to reproduce on eugenic grounds for the benefit of society made its legitimacy unstable. The "modern family" value succeeded in overcoming this crisis by employing the "right" rhetoric, meaning that judgment of doing reproduction depended on the couple's will. However, in the early 1990's, the opinion that criticism of procreation by unmarried persons made light of their intentions began to stand out. The "modern family" value countered this challenge with the "responsibility" rhetoric, that a person who wanted to have a baby should control themselves within the terms of the value to best protect the baby's life.
　This explicated the following two findings: First, this value, although exposed to the opposite opinions of reproduction for the sake of society or for the individual, has managed to retain its legitimacy. Second, this value has gradually strengthened its control over peoples' minds. In fact, society has come to estimate people by the strength of their faith in this value as well as by whether or, not they obey it.

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GnRHa-FSH法による過排卵刺激により採卵日時を調節することが可能であった. 15周期に卵巣刺激を行い, 13回のIVF, 12回のETを施行した. 平均FSH使用量は1管75単位を19.5管, 平均穿刺卵胞数8.9個, 平均回収卵数4.4個で卵回収率は49.1%であった.卵の分割率は52.6%, 妊娠率は23.1%であった. 妊娠例3例はすべて単胎で, 正期産に至り, 児の異常は認めなかった.

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